The 76 was a limited run of under 200.
The 76A is a 2 holer but a mod kit was available to upgrade to 3 tubes.
The 76CAis a 3 holer and had a Hypersil transformer for heavy duty and
often went to commercial and government customers includin embassies.
The 76PA was also a 3 holer with the EI laminations and was the standard
"ham" amp. Many of those have been upgraded.
The transformer in Pats amp is the plain old standard one, EI laminations
are only available in certain sizes and heavy duty would only increase the
thickness of the stack and windings. Mine has the same part # with an 0378
BTC is Berkshire Transformer of CT and was given as a source for many years
in QST and Handbooks. National Radio bought a lot from them.
All 76 models used 8874's.
----- Original Message -----
From: "Roger" <firstname.lastname@example.org>
Sent: Tuesday, September 13, 2011 12:08 AM
Subject: Re: [Amps] Alpha 76a
> On 9/12/2011 11:32 PM, k7fm wrote:
>> "Maybe there was an 76 alone, but maybe the "a" means America..... Who
>> There was a 76. It had a single meter and predated the 76A. May have
>> two 8874 tubes.
> There are quite a few 76As with only a pair of 8874s. I have one, but
> plan on going with a higher voltage transformer and a pair of 3CPX800s
> Roger (K8RI)
>> 73, Colin K7FM
>> Amps mailing list
> Amps mailing list
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