TenTec
[Top] [All Lists]

Re: [TenTec] Model 315 Receiver

To: Discussion of Ten-Tec Equipment <tentec@contesting.com>
Subject: Re: [TenTec] Model 315 Receiver
From: Byron Tatum <bjtatum1@att.net>
Reply-to: Discussion of Ten-Tec Equipment <tentec@contesting.com>
Date: Wed, 16 Mar 2022 23:31:52 +0000 (UTC)
List-post: <mailto:tentec@contesting.com>
 Thank you Paul-Byron W5FH
    On Wednesday, March 16, 2022, 06:26:59 PM CDT, AA2PM, Paul 
<aa2pm@earthlink.net> wrote:  
 
 Good afternoon, Byron:

 

I haven't spotted a source of the transistors you need, but you may wish to 
keep your eye on the Antique Electronics Supply web page (www.tubesandmore.com 
<http://www.tubesandmore.com> )

They have been adding at some germanium devices to their offerings.

 

73,

 

AA2PM, Paul Mondok

 

Before printing this document, please think about the environment.

 

 

 

-----Original Message-----
From: TenTec [mailto:tentec-bounces+aa2pm=earthlink.net@contesting.com] On 
Behalf Of Byron Tatum
Sent: Monday, March 14, 2022 10:10 PM
To: tentec@contesting.com
Subject: [TenTec] Model 315 Receiver

 

I received no replies to my post regarding the transistors in the Model 315 
receiver. I am speaking of the A138, A154, A2739 and BC418B devices. In trying 
to find data on them it appeared some were germanium devices. I looked at the 
Argonaut #505 schematics and found some identical circuits (exact same resistor 
and capacitor values) as used in the Model 315.        An example is the IF 
Amplifier, the model 315 Q-1 uses a A154 as IF amp and the model 505 uses a 
2N5134 (silicon device). The dual transistor Q4-A,B in model 315 is an A2739 
however in the model 505 each corresponding transistor is a 2N5133 (silicon 
device).        This continues throughout the comparisons of model 315 
identical circuits to model 505 ones, in general the A138 was replaced by the 
2N5133 or 2N5134. The A154 was replaced by the 2N5128 and the A2739 by a pair 
of 2N5133.

        I would surely like to hear from someone who has knowledge of these 
transistor types and what the ones in the model 315 are. I have gone into my 
model 315 and sure enough the devices are all just as shown on the schematics. 
I am curious about the logo on these transistors, all three part numbers have 
the same logo stamped on them. It is the capital letter A inside of a diamond. 
The A138 is a black epoxy appearing case (gold leads), the A154 is a white 
ceramic appearing case and the dual unit A2739 appears as a metal can TO-39 
size case.

        Thank you,

Byron W5FH

_______________________________________________

TenTec mailing list

 <mailto:TenTec@contesting.com> TenTec@contesting.com

 <http://lists.contesting.com/mailman/listinfo/tentec> 
http://lists.contesting.com/mailman/listinfo/tentec

_______________________________________________
TenTec mailing list
TenTec@contesting.com
http://lists.contesting.com/mailman/listinfo/tentec
  
_______________________________________________
TenTec mailing list
TenTec@contesting.com
http://lists.contesting.com/mailman/listinfo/tentec
<Prev in Thread] Current Thread [Next in Thread>