[Collins] help needed

[Glen Zook]

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
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