[TenTec] TL or TH 304's

[Bill Harris]

Ray; WA4TT:
Sorry to state my long term memory is starting to fade somewhat as well, however, if someone has an old edition of Editors and Engineers handbook handy,(late 40's; early 50's), you will find in the "Audio/Modulation" chapter a modulator using 304 TL or TH's in class A or AB. (memory fault) That will settle which Mu is best.  I'll vote for the TL in RF service and the TH in audio. I believe the TL's required a very "stiff" bias source which may have discouraged many home brewers from using them. Zero bias tubes were making the scene about then. The TL was also finicky above 20 meters but was doable.  Those old Eimac triodes were a beautiful sight with their cherry red plates.  Also great for keeping the shack warm.
Later
Bill-w7kxb

> From: Rsoifer at aol.com
> Date: Fri, 18 Jun 2010 10:37:20 -0400
> To: wa4tt at nlamerica.com; tentec at contesting.com
> Subject: Re: [TenTec] Orion AM ALC/304's
> 
> John,
>  
> Well, it was 50 years ago so I can't really be sure of anything!  As  best 
> I can recall, though, we had THs in the modulator and TLs in the Class C  
> finals.  The exciter was a Collins 310B and the receiver an A-line, I  believe 
> a 75A-2.
>  
> 73 Ray W2RS
>  
>  
> In a message dated 6/18/2010 3:26:42 A.M. GMT Standard Time,  
> wa4tt at nlamerica.com writes:
> 
> 
> 
> ----- Original Message ----- 
> From:  <Rsoifer at aol.com>
> >
> > Yes, indeed.  We actually had  three pairs of P-P 304TLs, one pair  each 
> > for
> > 80, 40 and  20.  The 2x 304TH modulator was, of course, switched   between
> > them. Those were the days.
> 
> You fellows sure it wasn't  the opposite...... TL's modulating the TH amp ?
> My memory works once in  awhile.....  !!
> 73
> WA4TT
> 
> 
> 
> 
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