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Re: [Amps] 2x 4cx1500b Rl

To: Benedikt Sveinsson <benedikts@vodafone.is>, "amps@contesting.com" <amps@contesting.com>
Subject: Re: [Amps] 2x 4cx1500b Rl
From: Bill Coleman <n2bc@stny.rr.com>
Date: Wed, 14 Sep 2016 19:42:12 -0400
List-post: <amps@contesting.com">mailto:amps@contesting.com>
Hi Benni, I plugged your values into a spreadsheet I cooked up ages ago - came up with 1250 ohms for Plate Load

3000V @ 1.5A, "K" value for AB = 1.65,

Plate load =  Plate E / (Plate I * K)

GL & 73, Bill  N2BC

On 9/13/2016 11:20 AM, Benedikt Sveinsson wrote:
Hi all

I brushing off a old project that I have been collecting parts for quite some 
time.

Was going to build a big SSPA, but I just can't throw this old project away, 
have all the parts and I always wanted to build a tube amp for HF, built few 
for vhf-uhf.

I'm now building the tank, and I have some questions about the Rl value

What value can I expect for these two tubes operating @3000v, max current is 
about 1.5A class AB - the normal calculation is giving quite low value
is about 1200 Ohms - Does anyone here have some real world experience what to 
expect or what values I should use when measuring the tank?


73, Benni TF3T



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