Need help testing antique tubes (SF Bay area)
DaveC
I have an antique AM/SW radio (1941 Philco "model 41-280, code 121") and
need to get the tubes tested. The problem is that they are so old that the
tube numbers don't show up on any tube tester listing that I've found,
except for one that was part of a fellow's antique radio-and-test
equipment collection at a local store (now since gone).
Anybody living in the SF bay area (I'm in the south penn. area) have a
tester that will test these tubes? I'd gladly show up with tubes in hand
at your convenience .
Any suggestions? I guess if I could find tube equivalents, I could test
them on modern testers (couldn't I?) Every tube cross-over book I've
looked in doesn't have these numbers.
The tubes are:
7A4
41
7C6
7B7
84 (a.k.a. 6Z4)
Also, are there any good mail-order source for these tubes? (Someone
already told me about Antique Electronic Supply, in AZ).
Any suggestions would be greatly appreciated. Direct e-mail replies, doubly so.
Thanks.
Enjoy,
Dave
--
Dave Carpenter
Sound Logic
Charlie Warfield, Jr.
Your tubes are not particularly unusual and almost any tester should be
able to handle them, so I am surprised you are having trouble. If all
else fails, Antique Electronic Supply will test them for a nominal fee,
but you have to pay shipping both ways. You may want to order a complete
set of replacement tubes since you will need them sooner or later
anyway. You can then substitute your tubes, one by one, with the known
good ones and by process of elimination find the bum tube.
Hope this helps!
Charlie
Alan Voorhees
There are other people that can test your tubes for you. I'm one
(Oakland), John Wentzel of Aladdin Radio in San Francisco is another.
There are a number of places to get tubes. At the bigget CHRS swap meets
there are always tube sellers. Also, there are a few people on the
internet that have tubes for sale. You can find their URLs at
http://www.antiqueradios.com/resources.shtml
Alan Voorhees
www.antiqueradios.com
Bill Smith
DaveC wrote:
> Also, are there any good mail-order source for these tubes? (Someone
> already told me about Antique Electronic Supply, in AZ).
>
> Any suggestions would be greatly appreciated. Direct e-mail replies, doubly so.
I am in the North Bay Area, so doubt I am much help for testing, but
another
source for tubes (much closer to you) is:
Alltronics
2300 Zanker Road
San Jose, CA 95131
Ask for their catalog.
Bryan Cowan
In article <voicebox-140...@dnai-207-33-180-28.dialup.dnai.com>,
voic...@dnai.com (DaveC) wrote:
> I have an antique AM/SW radio (1941 Philco "model 41-280, code 121") and
> need to get the tubes tested. The problem is that they are so old that the
> tube numbers don't show up on any tube tester listing that I've found,
> except for one that was part of a fellow's antique radio-and-test
> equipment collection at a local store (now since gone).
>
> Anybody living in the SF bay area (I'm in the south penn. area) have a
> tester that will test these tubes? I'd gladly show up with tubes in hand
> at your convenience .
>
> Any suggestions? I guess if I could find tube equivalents, I could test
> them on modern testers (couldn't I?) Every tube cross-over book I've
> looked in doesn't have these numbers.
>
> The tubes are:
> 7A4
> 41
> 7C6
> 7B7
> 84 (a.k.a. 6Z4)
>
> Also, are there any good mail-order source for these tubes? (Someone
> already told me about Antique Electronic Supply, in AZ).
>
> Any suggestions would be greatly appreciated. Direct e-mail replies,
doubly so.
There's an electronics store in Berkeley that sells tubes. I think it's Al
Lasher's, 1734 University, 510 843 5915. I also think they may have a tube
tester, but if they don't, they should be able to point you to one.
William W Janssen
DaveC wrote:
>
> I have an antique AM/SW radio (1941 Philco "model 41-280, code 121") and
> need to get the tubes tested. The problem is that they are so old that the
> tube numbers don't show up on any tube tester listing that I've found,
> except for one that was part of a fellow's antique radio-and-test
> equipment collection at a local store (now since gone).
>
> Anybody living in the SF bay area (I'm in the south penn. area) have a
> tester that will test these tubes? I'd gladly show up with tubes in hand
Check with ALLTRONICS in San Jose. They sell old tubes and may be
able to check with the testing. Otherwise buy a set and swap one
at a time till you find the bad one. Or put all new in and then
swap one at a time and find all the bad ones.
Bill K7NOM
Greg Cason
Xm...@XmidtownX.XnetX (Bryan Cowan) wrote:
>> Any suggestions? I guess if I could find tube equivalents, I could test
>> them on modern testers (couldn't I?) Every tube cross-over book I've
>> looked in doesn't have these numbers.
>>
>> The tubes are:
>> 7A4
>> 41
>> 7C6
>> 7B7
>> 84 (a.k.a. 6Z4)
>>
>> Also, are there any good mail-order source for these tubes? (Someone
>> already told me about Antique Electronic Supply, in AZ).
>>
Try Radio Relics
http://www.clge.com/radiorelics
************************************************************
* Greg Cason * c...@magicnet.net *
* Orlando, Florida * *
* USA * http://www.clge.com/ *
************************************************************
Go Magic!
Jim Cross
Greg Cason wrote:
>
> Xm...@XmidtownX.XnetX (Bryan Cowan) wrote:
>
>
> >> Any suggestions? I guess if I could find tube equivalents, I could test
> >> them on modern testers (couldn't I?) Every tube cross-over book I've
> >> looked in doesn't have these numbers.
> >>
> >> The tubes are:
> >> 7A4
> >> 41
> >> 7C6
> >> 7B7
> >> 84 (a.k.a. 6Z4)
> >>
> >> Also, are there any good mail-order source for these tubes?
Modern equivalents for the above have different basing, although many
tester settings would be the similar. the modern equivalents are:
7A4 - 6J5GT is the octal equivalent
41 - 6K6GT is the octal equivalent, 7B5 is the loktal equivalent, 6AR5
is the 7 pin mini equivalent
7C6 - very similar to type 75
7B7 - 7A7 is similar
84 (a.k.a. 6Z4) - 6X5 is the octal equivalent, 6X4 is the 7 pin mini
equivalent, and 7Y4 is the loktal equivalent.
BTW, I sell tubes by mail order. Check out my website at:
http://www.cinternet.net/~vactubes
Jim Cross - Vacuum Tubes Unlimited