[Collins] help needed

[Glen Zook]

At least for the major tube manufacturers, it really doesn't make a difference as to which company made the tube.  In many Collins S-Line and KWM-2- series the tone oscillator just doesn't "like" the 6EA8.  Of course, there are exceptions and some tone oscillators work fine with the 6EA8.  But, in general, the tone oscillators have problems with the 6EA8.
 
Glen, K9STH Website:  http://k9sth.com


________________________________
 From: Carl <km1h at jeremy.mv.com>
To: Glen Zook <gzook at yahoo.com>; Bob and Sue Jefferis <ljranch2010-ham at yahoo.com> 
Cc: collins at mailman.qth.net 
Sent: Sunday, January 29, 2012 9:57 PM
Subject: Re: [Collins] help needed
 
Might be manufacturer related, try different ones. Ive used the 6EA8 in all sorts of 6U8 circuits without problems but never cared to own  S Line (-;

Carl
KM1H


----- Original Message ----- From: "Glen Zook" <gzook at yahoo.com>
To: "Bob and Sue Jefferis" <ljranch2010-ham at yahoo.com>
Cc: <collins at mailman.qth.net>
Sent: Sunday, January 29, 2012 8:18 PM
Subject: Re: [Collins] help needed


No problems with the 6U8A. It is the 6EA8 that causes problems in that particular circuit and I don't really have a clue as to why. Of course, I haven't spent any time learning why since I have plenty of 6U8 tubes!

Glen, K9STH Website:  http://k9sth.com


________________________________
From: Bob and Sue Jefferis <ljranch2010-ham at yahoo.com>
To: Glen Zook <gzook at yahoo.com>
Cc: "drleborgne at aol.com" <drleborgne at aol.com>; "collins at mailman.qth.net" <collins at mailman.qth.net>
Sent: Sunday, January 29, 2012 6:42 PM
Subject: Re: [Collins] help needed

Glen,

Is a 6U8A close enough? I am aware of the fact that 6EA8 may not work reliably in the oscillator slot, but I believe the 6U8A is a little more robust than the 6U8 (definitely a Thanksgiving tube - Gobble, Gobble).

Bob, KF6BC
On Jan 29, 2012, at 12:39 PM, Glen Zook wrote:

> Check the tone oscillator, a 6U8. There has to be a tone present before you can tune the transmitter or to send CW.
> 
> Replace the tube, if bad, only with a 6U8. Although the 6EA8 can be used to replace the other 6U8 tubes, the tone oscillator often will not work properly if a 6EA8 is substituted.
> 
> Glen, K9STH Website: http://k9sth.com
> 
> 
> ________________________________
> From: "drleborgne at aol.com" <drleborgne at aol.com>
> To: collins at mailman.qth.net
> Sent: Sunday, January 29, 2012 9:25 AM
> Subject: [Collins] help needed
> 
> 
> Dear collins aficionados: I am in the process of recondicion a 32-S1 ( I am no expert) Voltage, resistance and signal
> 
> tracing are Ok and adequate signal gets to the grids of , power tubes, but can not obtain grid meter excitation nor
> 
> can I get power out, I have changed a burned resistor, and measurements and close inspection look good.
> 
> What could be hiding there, what should I look for ?. Thank you. KI4JRY martin
> ______________________________________________________________
> Collins mailing list
> Home: http://mailman.qth.net/mailman/listinfo/collins
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:Collins at mailman.qth.net
> 
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
> ______________________________________________________________
> Collins mailing list
> Home: http://mailman.qth.net/mailman/listinfo/collins
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:Collins at mailman.qth.net
> 
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
______________________________________________________________
Collins mailing list
Home: http://mailman.qth.net/mailman/listinfo/collins
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:Collins at mailman.qth.net

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html


-----
No virus found in this message.
Checked by AVG - www.avg.com
Version: 10.0.1416 / Virus Database: 2109/4775 - Release Date: 01/29/12