[Drakelist] FOR SALE: Drake T4XC Transmitter and AC4 Power Supply

[William Mills]

  Excellent condition Drake T4XC transmitter and AC4 power supply for sale.  
Also, AC4 power supply capacitor upgrade kit to be installed.  If interested, 
send me an e-mail or call (478-452-2957) and make a reasonable offer on the 
package or single items.

  73,
  Bill Mills
  KC4AA___
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Re: [Drakelist] Exploding cap' ???

[Ed Tanton]

I forgot to mention I was present when one within my Drake L7 went. Filled
the basement with little tiny things that looked a lot like tiny black
butterflies fluttering to the floor. I don't remember if diodes went or not.
But it did repair easily enough.

 

Ed Tanton
 
website:   http://www.n4xy.com 
 
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Norton AntiVirus with AutoProtect 

--
Wag more / Bark less
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///snip


I had this happen to an R-4B probably 25 years ago. A medium sized lytic
went off like a bomb. Many tiny fragments to extract from under the chassis
but upon replacing the cap, all was fine. Very startling.

-- 
Charles Ring W3NU

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Re: [Drakelist] Exploding cap' ???

[Charles Ring]

On 8/23/2012 1224, Damien Mannix wrote:

Hi all,

Bought an immaculate looking TR4 which has been out of use a long 
time.  Also bought an AC4 which claims to have had the original EHT 
caps and diodes replaced.


Powered them up with 20 vac for four hours, then up in 20 v steps at 
four hours per step, listening and sniffing for any problems.  Reached 
220 vac an hour ago.  AC4 slightly warm and centre of TR4 top a bit 
warmer.  Then there was one hell of a crack!  Sounded like a gunshot 
and frightened me to death! Swiched off immediately of course.  No 
smell that I can detect.


Is that what an exploding capacitor sounds like?  Any advice on where 
to start looking?  The TR4 or the AC4?


Sad day for me.  Trying to return to the hobby after over 30 years.  
Been too busy making a living and bringing up a family.


Regards,

Damien
G3XER



I had this happen to an R-4B probably 25 years ago. A medium sized lytic 
went off like a bomb. Many tiny fragments to extract from under the 
chassis but upon replacing the cap, all was fine. Very startling.


--
*Charles Ring W3NU*
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Re: [Drakelist] Exploding cap' ???

[Ed Tanton]

Is it possible power supply was set for 110V not 220V? I do not believe it's
the TR4-although of course it could be. If it was, I should think you would
have lost a diode(s) or Heaven-forbid: the transformer. It could have been a
faulty diode that caused it-hence, after making sure about the input voltage
selector (and if it's correct, I'd check its wiring) I'd check all the
diodes.

 

Finally, it's always possible it was just the capacitor's time having come.
If you've made sure about the voltage setting, then replace the cap, do the
same start-up routine, and then the SAME cap goes, then yeah, it's obviously
not the caps, but something else going on. 

 

Before you walk-away for the run-time test, I'd check all the voltages just
to be sure they're right. That way, if it does go again (or some other cap)
you'll know at least it LOOKED right prior to catastrophe.

 

Ed Tanton
 
website:   http://www.n4xy.com 
 
All emails  &  checked by 
Norton AntiVirus with AutoProtect 

--
Wag more / Bark less
--

 

From: drakelist-boun...@zerobeat.net [mailto:drakelist-boun...@zerobeat.net]
On Behalf Of Damien Mannix
Sent: Thursday, August 23, 2012 12:24 PM
To: drakelist@zerobeat.net
Subject: [Drakelist] Exploding cap' ???

 

Hi all,
 
Bought an immaculate looking TR4 which has been out of use a long time.
Also bought an AC4 which claims to have had the original EHT caps and diodes
replaced.
 
Powered them up with 20 vac for four hours, then up in 20 v steps at four
hours per step, listening and sniffing for any problems.  Reached 220 vac an
hour ago.  AC4 slightly warm and centre of TR4 top a bit warmer.  Then there
was one hell of a crack!  Sounded like a gunshot and frightened me to death!
Swiched off immediately of course.  No smell that I can detect.
 
Is that what an exploding capacitor sounds like?  Any advice on where to
start looking?  The TR4 or the AC4?
 
Sad day for me.  Trying to return to the hobby after over 30 years.  Been
too busy making a living and bringing up a family.
 
Regards,
 
Damien
G3XER

___
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[Drakelist] Exploding cap' ???

[Damien Mannix]

Hi all, Bought an immaculate looking TR4 which has been out of use a long time. 
 Also bought an AC4 which claims to have had the original EHT caps and diodes 
replaced. Powered them up with 20 vac for four hours, then up in 20 v steps at 
four hours per step, listening and sniffing for any problems.  Reached 220 vac 
an hour ago.  AC4 slightly warm and centre of TR4 top a bit warmer.  Then there 
was one hell of a crack!  Sounded like a gunshot and frightened me to death!  
Swiched off immediately of course.  No smell that I can detect. Is that what an 
exploding capacitor sounds like?  Any advice on where to start looking?  The 
TR4 or the AC4? Sad day for me.  Trying to return to the hobby after over 30 
years.  Been too busy making a living and bringing up a family. Regards, 
DamienG3XER  ___
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Re: [Drakelist] Drakelist Digest, Vol 50, Issue 16

[richard radke]

Hey Evan,

Great to hear from you.  Hope everything is FB.  I cleaned the gain  
pot last time I was in the amp and replaced the 5K 7 watt'er (just  
cuz) when I re-built the supply.  The whole ALC set-up has never  
really worked very well, but haven't had anything to compare it to  
either, other than my 1000MP MK V, which isn't a fair comparison.   
Other than a "parts unit" is that pot and switch available anywhere?


Rick
W9WS



On Aug 22, 2012, at 2:57 PM, K9sqg wrote:


Rick,

I've never found the ALC pot to be particularly touchy.  However, I  
have repaired several L4Bs that had an open taper caused by the 5K  
7 watt resistor in the power supply opening.  It could be that the  
taper has opened or developed a weak spot that is circumvented by  
the wiper crossing that area.  Just not sure about this one.


73,

Evan, K9SQG

-Original Message-
From: richard radke 
To: drakelist 
Sent: Wed, Aug 22, 2012 2:31 pm
Subject: Re: [Drakelist] Drakelist Digest, Vol 50, Issue 16

Hi Bob,

What do you mean by doesn't work?  My T-4XC with the L4B is pretty
"heavy-handed".  Just a slight advance of the L4B's gain control
drops the pwr output big time.  Almost makes me think the pot isn't
linear.  Makes it really tuff to find that sweet-spot.  I typically
leave the ALC line unplugged and watch the scope.

Rick
W9WS



On Aug 22, 2012, at 11:00 AM, drakelist-requ...@zerobeat.net wrote:

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> Today's Topics:
>
>1. FS  R4C Crystals  173 total crystals (douglas nyman)
>2. Re: is Drake closing? (ve...@cogeco.ca)
>3. T-4XB AGC (ROBERT SMITH)
>
>
>  
--

>
> Message: 1
> Date: Tue, 21 Aug 2012 18:28:10 -0500
> From: douglas nyman 
> To: Drake group 
> Subject: [Drakelist] FS  R4C Crystals  173 total crystals
> Message-ID: 
> Content-Type: text/plain; charset="iso-8859-1"
>
>
>
>
>
>I have 173 crystals for the R4C radio. All but 6 or 7 crystals
> had drifted over 5 khz. The rest had drifted 2,3 or 4 khz. No dead
> crystals. I no longer have any Drake equipment sorry to say. Rather
> than sell these crystals off piece by piece I would take offers on
> the whole lot. I will send any interested party an inventory list.
> Please contact me off the list.  Doug  SWL
 
> -- next part --
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>
> Message: 2
> Date: Tue, 21 Aug 2012 20:42:50 -0500
> From: ve...@cogeco.ca
> To: drakelist@zerobeat.net
> Subject: Re: [Drakelist] is Drake closing?
> Message-ID: <5034391a.22d.214d.21...@cogeco.ca>
> Content-Type: text/plain; charset="iso-8859-1"
>
>
> Bill
>
> Just curious (in your opinion perhaps)was Drake purchased as an
> investment by B-T or just to get the name and get
> them out of the competitive way??  Maybe this is the way of
> business, but it would seem a bit expensive to buy them out
> just to put them out of business??
>
> So I suppose my theory that Drake would buy out Palstar (located
> just up the road in Piqua, Ohio) and make a triumphant
> return to the amateur radio market.
>
> Yes I know, dream on.  Sorry to see the demise of Drake.  Wonder
> what Bob Drake would say about this turn of events??!?
>
> Thanks Bill for the bits of Drake history that you have shared with
> the list.  VERY much appreciated!!
>
> Bill VE3ES
>
>
>
>>
>>
>>
>> Hello,
>>
>> Drake hasn't been Drake as you guys knew Drake for a long time. ?
>> The company was mainly producing video and cable
> head
>> end products, see their web-site. ?Amateur radio manufacturing and
>> or service was history, long gone, even with the
>> production of the R-8 series receivers, SW-8 etc. ?The company was
>> sold, sold again, and recently sold again to
>> Blonder-Tongue another video and cable product manufacture, This
>> company was Drakes largest competitor and is located
>> in New Jersey, see their web-site. Most of the Drake employees
>> were slowly let go, from the top down, all except for a
>> few from sales, engineering and one guy from service. ?These
>> people will move to Springboro Pike, there will be NO
>> manufacturing at this building, save for what engineering builds,
>> manufacturing will be done in New Jersey or .
>> ?The Drake name will be used on some products built by Blonder-
>> Tongue as the name Drake is well kno