[AMRadio] RE: GB> WTD: 808 Tubes

[Merz Donald S]

Actually I think the 35T is a great choice. That is an excellent tube in every respect. Great ratings. Solidly built. Low interelectrode capacitance so frequencies over 25mc are at least possibilities.

My only reason for not wanting to use one is selfish--I already have a rig that uses the 35T in a single-ended final--the Gross CB-80. So I want this rig to be something different. 

Otherwise I think the 35T is a good choice!

73, Don Merz, N3RHT

PS: In response to those who have asked, I will get before and after pictures up on the web as soon as "after" is complete. I am working on the exciter right now. The RF deck and antenna tuner are done. The modulator is next.




-----Original Message-----
From: Michael Barlow [mailto:badl79 at yahoo.com]
Sent: Monday, December 09, 2002 8:53 PM
To: Merz Donald S; baswaplist; amradio at mailman.qth.net;
greenkeys at mailman.qth.net; glowbugs at piobaire.mines.uidaho.edu; Old Tube
Radios
Subject: Re: GB> WTD: 808 Tubes


Hi Don. I just wanted to point out that a 35T may not 
be such a bad choice. According to the 1948 ARRL
Handbook (and other sources), the 35T has a 50 watt
plate dissipation rating, the same as the 50T and 808.
In plate modulated class "C" service, it is rated to
deliver 120 watts output, vs 105 watts for the 808.
        73 de Ron n4gjv     
--- Merz Donald S <merz.ds at mellon.com> wrote:
> I need a coupla-three 808 tubes. If you have one or
> more to spare, then I'd like to hear from you.
> Alternatively, I can use Eimac 50T or 75TL. 
> 
> This 30's rack TX I am restoring (he of the many
> meter holes) has a single-ended Eimac 50T in the
> final. But that tube is just too rare. The few
> examples I have seen go by on eBay eventually sold
> for $60 each or so--too much. I don't want to drop
> back to the 35T and the 100TH or TL is too big of a
> jump for the modulator and power supplies. 
> 
> But 808's would work. So I am looking at the 808
> circuit in the 1939 ARRL Handbook page 191. It uses
> B&W TVL coils too and I have some of those. But I
> don't got no 808's. I just need one to run and a
> spare or 2.
> 
> Any help appreciated. I have other tubes to trade or
> US greenbacks.
> 
> 73, Don Merz, N3RHT
> 
> 
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