Upgrading to real RF-service tubes (6146's come to mind :) kinda pales
when compared to that kind of mod.
Curt
LEE BAHR wrote:
Many years ago, just before Drake stopped accepting TR-4 s for repair,
my neighbor, WA5VGO sent his TR-4 to Drake for some repair. The radio
came back with three
Many years ago, just before Drake stopped accepting TR-4 s for repair, my
neighbor, WA5VGO sent his TR-4 to Drake for some repair. The radio came
back with three different final tubes then when shipped to Drake. One of
the three new tubes was as you described. A sweep tube with a printed
cir
Boy that was the first time I posted to the list. Thanks for all the
info Mike, KB1EZL
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Yes, I really should do that, John. Bob was a Collins engineer and had many
interesting experiences. I'll put that on the "to do" list.
73,
Don, WB5HAK___
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Garey,
A TR-4 PA cage ( without the top cover installed ) is 3 3/8 inches tall.
I have had good luck with GE's, Zenith, RCA, and Sylvania's of course. I
hadn't seen any that were too tall, at least not yet, HI HI. The 6GJ5's are
worth a try if you can find they cheap. I have a few that came fr
6JB6's can be matched with a Drake transmitter. Set the bias on the AC-4 and
leave it be. Then measure the voltage drop across each cathode resistor with
the PTT keyed, no mic. Use ohms law to figure the current of each tube. You
probably would want to check the resistance of each cathode resist
ject: Re: [Drakelist] 6JB6 vs.6JB6A
Gary -
I have run into the size problem also. The RCA manual specifies outline
18A and 32 for the 6GJ5 and 6GJ5A respectively. As discussed yesterday, I
have also seen 6JB6(A) that were too tall, but not of the 'four' brands.
Do you have a
I have both, a B&K emisions tester and a Hickok 6000A transconductance tester.
The emisions tester is useless for testing 6JB6's beyond shorts or open
filaments. Over the years I kept most of the 6JB6 pulls from my Drakes and
others I repaired. With the Hickok I was able to go through them and p
Hello!
Just to complicate a bit more this subject ;-), some years ago I worked on a
TR-4C which had 6JM6 tubes on it. You can read about that here:
http://jvgavila.com/dktr4c_1.htm
They had a professional-looking adaptor on their bases but, definitely, worked.
And were labeled as 6JB6A!
So it s
Gary -
I have run into the size problem also. The RCA manual specifies outline
18A and 32 for the 6GJ5 and 6GJ5A respectively. As discussed yesterday,
I have also seen 6JB6(A) that were too tall, but not of the 'four'
brands. Do you have a transmitter open where you can measure the ACTUAL
I own a few pairs of 6GJ5's, one pair is too high to fit into the 4-line PA
compartment. Neither set of tubes would neutralize in a T-4XC. I havent
tried adding or removing capacitance to the neutalizing trimmer to see if I
could get them to work. Just a heads up.
73, Gary
NOS at $2 and $3 ea some years
ago.and they are to me, indistinguishable from the JB6s.
John k5mo
At 02:25 AM 9/30/2010, Douglas wrote:
>Date: Wed, 29 Sep 2010 20:49:08 -0500
>From: "Curt"
>Subject: Re: [Drakelist] 6JB6 vs.6JB6A
>To:
>I'll never again buy
>Date: Wed, 29 Sep 2010 20:49:08 -0500
>From: "Curt"
>Subject: Re: [Drakelist] 6JB6 vs.6JB6A
>To:
>I'll never again buy vacuum tubes off of the internet, after buying from a
>regular "store" on the auction site two "matched" 6JB6s, bot
Hi Don,
Why not videotape an interview with this great OT and post it somewhere
where we can all enjoy it. I have seen several similar interviews and they
are really great.
73,
John, W4AWM
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ht
And, as always, my snide comment was tongue FIRMLY planted in the cheek. Don't
check out too early Chuck. I have a good friend in Richardson, TX, K5AY, in
his 90's and you don't want to either challenge him to an electronic or antenna
question, or challenge him to a CW speed run. He WILL win
Meant to add, QCWA, 45 years.
On Wed, Sep 29, 2010 at 9:59 PM, Chuck Grandgent wrote:
> Of course this was only tongue-in-cheek. I plan on checking out in 2025,
> long before I get to my 90's.
>
>Chuck
>
>
> On Wed, Sep 29, 2010 at 9:53 PM, Don Cunningham wrote:
>
>> If they were Sylvania,
Of course this was only tongue-in-cheek. I plan on checking out in 2025,
long before I get to my 90's.
Chuck
On Wed, Sep 29, 2010 at 9:53 PM, Don Cunningham wrote:
> If they were Sylvania, Chuck, you probably could, but GE's? I don't
> know about that. I think that's one of the brands
If they were Sylvania, Chuck, you probably could, but GE's? I don't know
about that. I think that's one of the brands that sometimes won't neutralize.
I may be wrong, and it may be RCA, but some of them don't seem to make it.
73,
Don, WB5HAK___
D
I'll never again buy vacuum tubes off of the internet, after buying from a
regular "store" on the auction site two "matched" 6JB6s, both soft as
pillows and useless above 40M. Of course, everything there is always
"as-is". I'll also never buy anything from a big tube seller in Florida who
is
I have a matched pair (GE) from RF Parts I got maybe 10 years ago, packed in
a wooden salt cod box. Counting on the sale proceeds to fund my retirement
when I get to my 90's :)
Chuck, K1OM
On Wed, Sep 29, 2010 at 9:33 PM, Don Cunningham wrote:
> The same date code doesn't have much to do wi
The same date code doesn't have much to do with matching, Richard, but they
probably are close. There is a proceedure used for matching, but you'd have to
have a basketfull of them to use it anymore. Drake original tubes have a
number written on top of them in magic marker. I've been lucky en
There is a write up from Bill Frost on Drake's final matching procedure,
and Bill's recommendations on how we should be doing it, on N9BOR's Drake
website, _http://www.qsl.net/n9bor/drake.htm_
(http://www.qsl.net/n9bor/drake.htm) . It is worth a look.
73
Lee WB6SSW
VE3CUI - VE3XZ
- Original Message -
From: <mailto:r79b...@gmail.com>m coffey
To: <mailto:drakelist@zerobeat.net>drakelist@zerobeat.net
Sent: Wednesday, September 29, 2010 4:56 PM
Subject: [Drakelist] 6JB6 vs.6JB6A
Thanks for the info on 6jb6 v
* m coffey
> *To:* drakelist@zerobeat.net
> *Sent:* Wednesday, September 29, 2010 4:56 PM
> *Subject:* [Drakelist] 6JB6 vs.6JB6A
>
> Thanks for the info on 6jb6 vs. 6JB6A. I have seen a few 6JB6 of both
> varieties on line, often advertised as MATCHED. I wonder how they have
&g
I - VE3XZ
- Original Message -
From: m coffey
To: drakelist@zerobeat.net
Sent: Wednesday, September 29, 2010 4:56 PM
Subject: [Drakelist] 6JB6 vs.6JB6A
Thanks for the info on 6jb6 vs. 6JB6A. I have seen a few 6JB6 of both
varieties on line, often advertised as MATCHED. I wonder
Thanks for the info on 6jb6 vs. 6JB6A. I have seen a few 6JB6 of both
varieties on line, often advertised as MATCHED. I wonder how they have
matched them as some have listed an emmisson only tube tester as the match
unit. I am very leary of these so called matched tubes! Even the ones from
the larg
Mike -
The 6JB6A is identical to the 6JB6 with the exception that the "A"
version is spec'd for 11 second filament warmup. This was a spec that
came along because many TV sets were series filament strings, (which is
also where the 3, 16, 19, etc. filament tubes came from,) and tubes
warming
Although I have been a member of the list for a while now, this is the first
time that I have tried to post to it, so I hope that I have done this
correctly!
My question is that I have seen 6JB6A (vs. straight 6JB6) tubes listed
for sale. I am wondering what difference(s) there are between th
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