Re: [drakelist] AC-4R upgrades

[Garey Barrell]

Garey Barrell <[EMAIL PROTECTED]> made an utterance to the drakelist gang
--
Tom -

Yeah, that's typical.  You're taking the right approach, since a failure 
in the Bias supply can take out more than just the finals, even if the 
unit is in Standby.


#4.  Yes, this is a VERY early AC-3.  I don't know how many were made, 
but I've only seen a couple in 40 years of using/working on Drake gear.  
They work just fine, but your plan is reasonable.  Drake dropped the 
choke, probably for  cost / weight / not needed  reasons.  The primary 
reason for it originally was to improve the regulation of the HV.


73, Garey - K4OAH
Atlanta

Drake 2-B, 4-B & C-Line Service Supplement CDs




Tom Taylor wrote:
I have a number of Drake A, B, and C twin combos. I decided to upgrade 
all the power supplies with AC-4R boards. Since most of the caps are 
now 30 to 40 years old, I don't want to risk a bias supply going out 
and ruining the finals or some short ruining the transformers. I order 
a bunch of blank boards since I already had some of the parts. The 
rest of the parts I ordered from DigiKey. I assembled all the boards 
at the same time and then started upgrading the AC-4s, one by one.


So far, all of the power supplies are different in one way or another 
and all of them have been modified by previous owners. Here are some 
examples:


#1) A previous owner replace the mid-voltage supplies' capacitors with 
a bundle of three caps mounted to the upper end the supply.


#2) A previous owner replaced the sand resistor below the chassis with 
two higher wattage resistors mounted to the upper end of the supply.


#3) A previous owner replaced one of the diodes in the HV supply. The 
transformer in this supply has transformer bolts inserted the wrong 
direction to mount the AC-4R board. Unfortunately, it's not as simple 
as removing the bolts and inserting them in the other direction 
because the bolts are just long enough to reach, but not long enough 
to add the board spacers.


#4) This is an AC-3, serial #101. I've never seen a Drake power supply 
like this. There's a large choke mounted adjacent to the transformer. 
All of the other parts, including the capacitors, are radial lead caps 
that are packed underneath the very low chassis. Has anyone else seen 
an early AC-3 like this? I'm planning to remove the choke and 
rebuilding the supply just like all of the others since all of the 
circuitry is now on the AC-4R board.


Thanks,
Tom N7TM

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Re: [drakelist] AC-4R upgrades

[Tom Taylor]

Would I be destroying something of historical worth by converting that
early, and perhaps rare AC-3, to a modern supply? That would mean removing
the choke and essentially all the parts underneath the chassis? The AC-4R
(as I'm sure you're aware) replaces everything but the transformer, the
cables, the connectors, and the bias pot.

On 12/11/06, Garey Barrell <[EMAIL PROTECTED]> wrote:


Tom -

Yeah, that's typical.  You're taking the right approach, since a failure
in the Bias supply can take out more than just the finals, even if the
unit is in Standby.

#4.  Yes, this is a VERY early AC-3.  I don't know how many were made,
but I've only seen a couple in 40 years of using/working on Drake gear.
They work just fine, but your plan is reasonable.  Drake dropped the
choke, probably for  cost / weight / not needed  reasons.  The primary
reason for it originally was to improve the regulation of the HV.

73, Garey - K4OAH
Atlanta

Drake 2-B, 4-B & C-Line Service Supplement CDs




Tom Taylor wrote:
> I have a number of Drake A, B, and C twin combos. I decided to upgrade
> all the power supplies with AC-4R boards. Since most of the caps are
> now 30 to 40 years old, I don't want to risk a bias supply going out
> and ruining the finals or some short ruining the transformers. I order
> a bunch of blank boards since I already had some of the parts. The
> rest of the parts I ordered from DigiKey. I assembled all the boards
> at the same time and then started upgrading the AC-4s, one by one.
>
> So far, all of the power supplies are different in one way or another
> and all of them have been modified by previous owners. Here are some
> examples:
>
> #1) A previous owner replace the mid-voltage supplies' capacitors with
> a bundle of three caps mounted to the upper end the supply.
>
> #2) A previous owner replaced the sand resistor below the chassis with
> two higher wattage resistors mounted to the upper end of the supply.
>
> #3) A previous owner replaced one of the diodes in the HV supply. The
> transformer in this supply has transformer bolts inserted the wrong
> direction to mount the AC-4R board. Unfortunately, it's not as simple
> as removing the bolts and inserting them in the other direction
> because the bolts are just long enough to reach, but not long enough
> to add the board spacers.
>
> #4) This is an AC-3, serial #101. I've never seen a Drake power supply
> like this. There's a large choke mounted adjacent to the transformer.
> All of the other parts, including the capacitors, are radial lead caps
> that are packed underneath the very low chassis. Has anyone else seen
> an early AC-3 like this? I'm planning to remove the choke and
> rebuilding the supply just like all of the others since all of the
> circuitry is now on the AC-4R board.
>
> Thanks,
> Tom N7TM

RE: [drakelist] Shure 444 element size?

[Jim Shorney]

"Jim Shorney" <[EMAIL PROTECTED]> made an utterance to the drakelist gang
--
On Sat, 9 Dec 2006 17:51:35 -0500, Chuck Wyatt wrote:

>
>"Chuck Wyatt" <[EMAIL PROTECTED]> made an utterance to the drakelist gang
>--
>Thanks, Jim!  Do you know if there is a significant difference between the
>444 and 444D ?  I'm seeing more 444D's available it seems.


The 444D is dual impedance, with a switch on the bottom to select high or low
impedance.  There is no transformer, the element itself has high and low
taps.  Otherwise the element appears the same, maybe slightly less deep than
the 444.

Point of trivia, the ElectroVoice repair service is now located in the former
HyGain Electronics plant in Lincoln (now Bosch/Telex) where I work, and they
do still service some of the old microphones.  I don't know about the 630 (I
suppose I could walk over to customer service and ask tomorrow...).  I'm in a
different department and don't have anything to do with the EV mics myself.

73

-Jim



-- 
Jim Shorney  -->.<--Put complaints in this box
jshorney (at) inebraska.com
Ham Radio NU0C
Lincoln, NE, USA
EN10ps
http://incolor.inetnebr.com/jshorney/

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RE: [drakelist] Shure 444 element size?

[Jim Shorney]

"Jim Shorney" <[EMAIL PROTECTED]> made an utterance to the drakelist gang
--
On Sun, 10 Dec 2006 16:19:38 -0500, Chuck Wyatt wrote:

>Now that I've rewired the EV-630 switch to work with PTT, I'm getting a hum
>through the speaker when I touch the mic body only when the mic is not
>keyed.  Problem seems to be that the on/off switch is SPST, one of the
>element leads is grounded.  If I contact the TR-3 ground to either element
>lead it will key the rig.  
>
>Any tips or tricks, before I go off and try and get lucky with a niche DPST
>for this setup?


Wire the mic element so it is "on" all the time, not running through the
switch (will work with VOX this way).  Use the switch only to switch the PTT
to ground, there should be no connection to the mic element high.  Mic
ground, mic case/stand ground, and PTT ground should all be common.  If this
was a surplus PA mic there may not be enough wires in the cord and you will
need a new cord - you should have, at minimum, a shielded wire for audio and
an unshielded wire for PTT, possibly with another unshielded wire for PTT
return that can be connected to common ground with the audio shield.

Hope that makes at least a little sense

73

-Jim


--
TR7/RV7, TR6/RV6, T4XC/R4C, L4B, NCL2000, SB104A, R390A, GT550A/RV550A - all 
vintage, all the time!


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[drakelist] Tube testers?

[Bill Maddock]

I am looking for a good condition used tube tester to keep my drakes
  in tip top shape! What are the best ones to buy for our radios? Is Heathkit
  ok? How about B&K? Does anyone have one that they would like to sell?
   
  Thanks and Merry Christmas,
   
  Bill N4ZI  Munford, TN

 
-
Have a burning question? Go to Yahoo! Answers and get answers from real people 
who know.

Re: [drakelist] parts

[Ken Winterling]

Rob,

The original feet for the AC-4, when used stand alone, had a 6-32 stud
projecting from a rubber "bumper" that protected the table top.  These were
removed when the AC-4 was inserted in a MS-4 speaker cabinet.  The feet were
then used to secure the AC-4 to the MS-4 cabinet which had its own feet that
were longer.

Below is one site where you can get these AC-4 feet.  I have no interest in
Donny's site other than as a satisfied customer.  I have purchased the B and
C line blue filters and white diffusers from him.

http://www.wa9tgt.com/Drake_Cabinet_Feet_Bumpers.html

As for crystals, everybody has their favorite source.   I use JAN Crystals
for the B and C lines I own/repair.  I don't buy used crystals because you
don't know what you are getting and most sellers want close to what JAN
charges for a new one.  Also, JAN provides a guarantee and will replace a
defective xtal.  How many sellers of used xtals will do that?

73,

Ken, WA2LBI


On 12/9/06, R. Ton <[EMAIL PROTECTED]> wrote:



"R. Ton" <[EMAIL PROTECTED]> made an utterance to the drakelist gang
--
It's a standard 6-32 machine thread in the AC-4.  1/4" screw should work
fine -- these are available in any hardware store.  (I'm not aware of
any rubber coating).

73, Rob (KFØRT)
> Anyone out there have a source for the screws that hold the MS4 power
> supply to the AC4 cabinet? Think the heads are covered with rubber. If
> not,how about the size for them?
> Also am in need of a 100khz calibrator crystal.
> Thanks
> Rusty
> WB9FIU

Re: [drakelist] Shure 444 element size?

[Jim Shorney]

"Jim Shorney" <[EMAIL PROTECTED]> made an utterance to the drakelist gang
--
On Sat, 9 Dec 2006 22:16:20 -0600, Bill Jackson wrote:

>If memory serves me, the 444 was grey in color and was a high impedance
>microphone.  The 444D is black in color and is dual impedance, both high and
>low.


Correct.  The 444 is a great color match for the 4-line Drakes, and the 444D
looks pretty sharp next to a TR7.  Not to mention the fact that they sound
great on SSB.


73

-Jim


-- 
Jim Shorney  -->.<--Put complaints in this box
jshorney (at) inebraska.com
Ham Radio NU0C
Lincoln, NE, USA
EN10ps
http://incolor.inetnebr.com/jshorney/

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[drakelist] Drakelist; No output TR7

[Frank Woolfe]

Gents,

 

I have lost output on my TR7 on 10m all other bands are OK with full power
out, only 10 that seems to be the problem, any ideas where to look first?

 

Frank

VK5MFW

RE: [drakelist] Shure 444 element size?

[Chuck Wyatt]

"Chuck Wyatt" <[EMAIL PROTECTED]> made an utterance to the drakelist gang
--
Ken Sands suggested double-checking that EV element, which I did and it
appears good.   Seems to drive the TR-3 just great!

Thanks to all for the measurements on the 444/444D and clarification -- I
may need to go that route. 

Now that I've rewired the EV-630 switch to work with PTT, I'm getting a hum
through the speaker when I touch the mic body only when the mic is not
keyed.  Problem seems to be that the on/off switch is SPST, one of the
element leads is grounded.  If I contact the TR-3 ground to either element
lead it will key the rig.  

Any tips or tricks, before I go off and try and get lucky with a niche DPST
for this setup?

Thanks folks,

Chuck
W1CEW


-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Jim Shorney
Sent: Saturday, December 09, 2006 5:46 PM
To: Chuck Wyatt; drakelist@www.zerobeat.net
Subject: Re: [drakelist] Shure 444 element size?


"Jim Shorney" <[EMAIL PROTECTED]> made an utterance to the drakelist
gang
--
On Sat, 9 Dec 2006 15:08:20 -0500, Chuck Wyatt wrote:

>Has anyone explored the insides of the 444 enough to have a sense
>of the size of the element? 


Looks like about 1-7/8 diameter by 7/8 deep.  Give or take a little.

-Jim



-- 
Jim Shorney  -->.<--Put complaints in this box
jshorney (at) inebraska.com
Ham Radio NU0C
Lincoln, NE, USA
EN10ps
http://incolor.inetnebr.com/jshorney/

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RE: [drakelist] Shure 444 element size?

[Chuck Wyatt]

"Chuck Wyatt" <[EMAIL PROTECTED]> made an utterance to the drakelist gang
--
Hi Jim,

Well after reading Ken's message last night, I was inspired to check it
further.  The element DOES give output, and may just have been my prejudice
based on the appearance of the element (some rust).  Also appeared to have a
lower output based on my multimeter, compared to my D104, but it does put
out.

I suppose if they stocked those original 630 elements, that would be
something, though!  Can't believe those would be hanging around, but who
knows.  Love the looks of this mic.  Looks like some art-deco inspiration.

-Chuck

-Original Message-
From: Jim Shorney [mailto:[EMAIL PROTECTED] 
Sent: Sunday, December 10, 2006 10:45 AM
To: Chuck Wyatt; drakelist@www.zerobeat.net
Subject: RE: [drakelist] Shure 444 element size?

On Sat, 9 Dec 2006 17:51:35 -0500, Chuck Wyatt wrote:

>
>"Chuck Wyatt" <[EMAIL PROTECTED]> made an utterance to the drakelist
gang
>--
>Thanks, Jim!  Do you know if there is a significant difference between the
>444 and 444D ?  I'm seeing more 444D's available it seems.


The 444D is dual impedance, with a switch on the bottom to select high or
low
impedance.  There is no transformer, the element itself has high and low
taps.  Otherwise the element appears the same, maybe slightly less deep than
the 444.

Point of trivia, the ElectroVoice repair service is now located in the
former
HyGain Electronics plant in Lincoln (now Bosch/Telex) where I work, and they
do still service some of the old microphones.  I don't know about the 630 (I
suppose I could walk over to customer service and ask tomorrow...).  I'm in
a
different department and don't have anything to do with the EV mics myself.

73

-Jim



-- 
Jim Shorney  -->.<--Put complaints in this box
jshorney (at) inebraska.com
Ham Radio NU0C
Lincoln, NE, USA
EN10ps
http://incolor.inetnebr.com/jshorney/

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Re: [drakelist] parts

[Dino Papas]

Dino Papas <[EMAIL PROTECTED]> made an utterance to the drakelist gang
--
The original screws that hold the AC-4 in the back of the MS-4 (or  
RV-4 series remote VFOs) do in fact have a hemispherical rubber "top"  
to them with the screw protruding from the centerthe rubber  
"handled" simply allows you to insert and tighten the screw without a  
screwdriver.  Less the rubber top a simple screw accomplishes the  
same function.


Dino KL0S/4

(still using those original four "rubber" screws to hold the AC-4  
inside my MS-4!)

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Re: [drakelist] Shure 444 element size?

[Ron Wagner]

Ron Wagner <[EMAIL PROTECTED]> made an utterance to the drakelist gang
--
Well I just opened my 444D and the element is about 1 7/8 inch diameter. 
Keep in mind that the cavity that an element sits in also had an effect on 
tonal quality.

73,
WD8SBB

On Sat, 9 Dec 2006, Chuck Wyatt wrote:


http://www.rigpix.com/accessories/electrovoice_630.htm

sturdy.  Has anyone explored the insides of the 444 enough to have a sense
of the size of the element?  I was thinking I could perhaps use it in the
nicer-looking 630 body.  The 630 element is maybe just under 2 inches
diameter.

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Re: [drakelist] parts

[Garey Barrell]

Garey Barrell <[EMAIL PROTECTED]> made an utterance to the drakelist gang
--
The "original" bumpers were the feet for the AC-4 Power Supply.  Most 
used them to mount the supply into the MS-4 Speaker Cabinet, because 
they were there.  They are available from McMaster Carr as "Threaded 
Rubber Bumpers" for about $6 for 25 pcs.  They are also available from 
WA9TGT at 2 for $1. 




Or you can find them on E*ay for about $10 for four pcs.

A regular 1/4" long, 6-32 Pan Head machine screw works just as well, for 
a lot less money!


I have a 100 KHz crystal, $16 shipped.

73, Garey - K4OAH
Atlanta

Drake 2-B, 4-B & C-Line Service Supplement CDs




R. Ton wrote:


"R. Ton" <[EMAIL PROTECTED]> made an utterance to the drakelist gang
--
It's a standard 6-32 machine thread in the AC-4.  1/4" screw should 
work fine -- these are available in any hardware store.  (I'm not 
aware of any rubber coating).


73, Rob (KFØRT)
Anyone out there have a source for the screws that hold the MS4 power 
supply to the AC4 cabinet? Think the heads are covered with rubber. 
If not,how about the size for them?

Also am in need of a 100khz calibrator crystal.
Thanks
Rusty
WB9FIU

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RE: [drakelist] Tube testers?

[Gerry]

The good ones cost an arm and a leg. Hickok and B&K are probably the ones
you'll see most often referred to as "good ones". Most radio and TV repair
businesses used B&K tube testers. Hickok made tube testers for the military
as the TV-7 series. The very best ones do their testing at frequencies far
below what the tube actually sees in applications. I think the Kickok
testers work around 5kHz. Therefore tube testers a no good for testing sweep
tubes as these tubes were never designed for high power RF service. Myself
I use a Sencore TC-162 because I couldn't find a Hickok going for a decent
price. Regardless of what you end up with keep in mind that a tube tester is
not an absolute arbiter as to whether a tube is good or bad. They are good
for weeding out the bad ones with open filaments, shorts or leaks, etc. The
only real way to tell if a tube is good or bad is by direct substitution. 

 

-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Bill Maddock
Sent: Sunday, December 10, 2006 10:56 AM
To: drakelist@www.zerobeat.net
Subject: [drakelist] Tube testers?

 

I am looking for a good condition used tube tester to keep my drakes

in tip top shape! What are the best ones to buy for our radios? Is Heathkit

ok? How about B&K? Does anyone have one that they would like to sell?

 

Thanks and Merry Christmas,

 

Bill N4ZI  Munford, TN

  

  _  

Have a burning question? Go to Yahoo!
  Answers and get answers
from real people who know.

RE: [drakelist] Shure 444 element size?

[Jim Shorney]

"Jim Shorney" <[EMAIL PROTECTED]> made an utterance to the drakelist gang
--
On Sun, 10 Dec 2006 13:05:14 -0500, Chuck Wyatt wrote:

>Well after reading Ken's message last night, I was inspired to check it
>further.  The element DOES give output, and may just have been my prejudice
>based on the appearance of the element (some rust).


Well, what are you waiting for?  Hook it to a radio!

73

-Jim


--
TR7/RV7, TR6/RV6, T4XC/R4C, L4B, NCL2000, SB104A, R390A, GT550A/RV550A - all 
vintage, all the time!


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[drakelist] Shure 444 element size?

[Chuck Wyatt]

http://www.rigpix.com/accessories/electrovoice_630.htm

 

Hi folks,

 

I picked up an old Electrovoice 630 mic (see rigpix URL), mainly because I
really like to looks of it, I had hoped to use it with my new-to-me TR-3.
According to my digital multimeter, the element appears to be dead.  The
advice I've read about the Shure mic, is that the elements are really
sturdy.  Has anyone explored the insides of the 444 enough to have a sense
of the size of the element?  I was thinking I could perhaps use it in the
nicer-looking 630 body.  The 630 element is maybe just under 2 inches
diameter.

 

Anyway in the meantime my D104 works pretty well.

 

Thanks for any thoughts!

 

-Chuck 

 W1CEW

Re: [drakelist] Shure 444 element size?

[Bill Jackson]

"Bill Jackson" <[EMAIL PROTECTED]> made an utterance to the drakelist gang
--
If memory serves me, the 444 was grey in color and was a high impedance
microphone.  The 444D is black in color and is dual impedance, both high and
low.

73 de Bill

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Re: [drakelist] Tube testers?

[MNACE]

I use both the Hickok 6000A and the B&K Dyna-Jet 707.  They work well, and the 
vast majority of tubes I have pre-tested before restoring a Drake have 
performed very well.  

Mark 
N5KAE

  - Original Message - 
  From: Bill Maddock 
  To: drakelist@www.zerobeat.net 
  Sent: Sunday, December 10, 2006 9:56 AM
  Subject: [drakelist] Tube testers?


  I am looking for a good condition used tube tester to keep my drakes
  in tip top shape! What are the best ones to buy for our radios? Is Heathkit
  ok? How about B&K? Does anyone have one that they would like to sell?

  Thanks and Merry Christmas,

  Bill N4ZI  Munford, TN


--
  Have a burning question? Go to Yahoo! Answers and get answers from real 
people who know.

[drakelist] parts

[Rusty Richards]

Anyone out there have a source for the screws that hold the MS4 power supply to 
the AC4 cabinet? Think the heads are covered with rubber. If not,how about the 
size for them?
Also am in need of a 100khz calibrator crystal.
Thanks
Rusty 
WB9FIU

Re: [drakelist] Re: Oscillator alignment 40Mhz and 53.695Mhz

[Garey Barrell]

Frank -

First, be sure to connect your counter to Pin 19 rather than Pin 21.  
You may be able to get enough shift by changing C1006 to 47 pF.  
Sometimes spreading or compressing the turns on L1004 will buy a little 
more shift.  Be sure the 10R bus voltage is at least 9.97V.  It's also 
possible to shift the 40 MHz frequency by SLIGHTLY (no more than +/- 
0.3V) adjusting the 10V bus.  New crystals may be available from John 
Kriner.


The 53.695 MHz consists of the 40 MHz and the 13.695 MHz (BFO) 
oscillator, so the 40 MHz has to be right first!


You might find the attached document helpful if you don't already have it.

73, Garey - K4OAH
Atlanta

Drake 2-B, 4-B & C-Line Service Supplement CDs




[EMAIL PROTECTED] wrote:

*Morning all,*
*Deep into my new (to me) TR-7, I am attempting to align this unit.*
*I have a very accurate counter / analyzer (Aeroflex-IFR), and am 
attempting to align the 40Mhz and the 53.695Mhz oscillators.*
*After setting the 10.00 Volts, I moved on to the 40Mhz and 53.695Mhz 
oscillators.*
*When I attempt to align the 40Mhz, and approach 40Mhz with L1001, all 
seems well so I believe the coil is good but I lose lock as I approach 
40Mhz.  Closest I can get is 1.07kHz low.  I do get about 1.9kHz swing 
in the adjustment of the slug.*
*Second...when attempting to adjust the 53.695, I get close but cannot 
seem to get there.  I am low 2.441kHz, as the closest I can get.*
** 
*While I believe the crystals are both off, is there any hints and 
kinks (adding caps, etc?) to get this back in alignment?  *
** 
*Thoughts?*
** 
*Warm Regards,  Frank, KG9H*


TR7 Alignment.pdf
Description: Adobe PDF document

Re: [drakelist] Shure 444 element size?

[Jim Shorney]

"Jim Shorney" <[EMAIL PROTECTED]> made an utterance to the drakelist gang
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On Sat, 9 Dec 2006 15:08:20 -0500, Chuck Wyatt wrote:

>Has anyone explored the insides of the 444 enough to have a sense
>of the size of the element? 


Looks like about 1-7/8 diameter by 7/8 deep.  Give or take a little.

-Jim



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Jim Shorney  -->.<--Put complaints in this box
jshorney (at) inebraska.com
Ham Radio NU0C
Lincoln, NE, USA
EN10ps
http://incolor.inetnebr.com/jshorney/

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[drakelist] RE: audio waveform has warble/hum on it!

[frank]

OK, my TR-7 is getting back in line to what it left Ohio many years ago.
I have been listening pretty critically on the receive and it seemed on SSB 
like there was a slight warble on the audio.  When going to CW it was harder to 
hear but still there.  (I listen to 35+WPM so maybe I couldn't hear it.)  
Went to the Calibrator and it seems like the 25kHz calibrator signal is 
"jumping" up and down (in voltage) slightly, maybe  +/- 3% or so on the scope.  
Audio-wise it is hard to hear but.. it is there - warbling ever so slightly.  
There is also some sort of "other signal" in the background. The other signal 
is much lower in frequency, maybe 60Hz?  but the same amplitude! 
The scope seemed like it had problems syncing...  Any thoughts on this?  Frank 
KG9H