[HomeBrew] Homebrew amp question (link to pix)

[Carl Huether]

Well, I certainly recognize the components including the WW2 surplus tuning
unit band switch.
Since it is neutralized I would assume (bad word) that it is grid driven at
a very low power level. That would be in the 2-10W range.

Input , plate and load tune controls are obvious. One can take a reasonable
guess which is the meter switch with the other possibly being the mode
switch for the various classes.
Then there would be a filament and plate toggle switches.

All in all it appears rather straight foreward.
I only see one possible VR tube and a pot next to it, this could be to set
the bias idle current.
Unless the screen regulators are in the PS I would trace the circuit to be
sure it is not a grounded screen or cathode driven design which were
sometimes featured in articles of those days. See what I mean about
assumptions?
I'll take another guess that if it was an article it came from QST, Ham
Radio, ARRL or W6SAI Handbooks. Design and quality looks way too good for 73
or CQ (:

Carl
KM1H

----- Original Message -----
From: <brewerj@squared.com>
To: <homebrew@mailman.qth.net>
Sent: Wednesday, February 05, 2003 8:36 AM
Subject: [HomeBrew] Homebrew amp question (link to pix)


> ** Please do NOT cross-post messages to multiple mailing lists on the
"To:" or "CC:" line of the e-mail message. **
>
>
> I got a HB amp from a friend here locally, and its a fantastic
> piece of homebrew art. Unfortunately, although it came
> with cables and  the PS (the heath HP-24) it did NOT
> come with any docs (or meter settings!)
>
> How would you deal with the fact that there's two relatively
> fragile amp tubes, and no guide to interpreting meter readings,
> etc?
>
> The link is:
>
> http://www.old-radios.com/amp/amp.html
>
> Thanks!
> John K5MO
>
>
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