As I remember, the 304TH and TL had filaments that could be configured in
either series or parallel, for 10v/12.5A or 5v/25A respectively.
That filament transformer (prob 10v)might be useable in a good stiff 14v
supply.
Phil C. Sr.
k4dpk
----- Original Message -----
From: "Bill Harris" <w7kxb@msn.com>
To: <tentec@contesting.com>
Sent: Friday, June 18, 2010 12:21 PM
Subject: [TenTec] TL or TH 304's
>
> 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@aol.com
>> Date: Fri, 18 Jun 2010 10:37:20 -0400
>> To: wa4tt@nlamerica.com; tentec@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@nlamerica.com writes:
>>
>>
>>
>> ----- Original Message -----
>> From: <Rsoifer@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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