[AMRadio] My Amplifer Quest took a strange turn today


Bill Smith hbco2 at sbcglobal.net
Sat Apr 21 00:05:21 EDT 2007


Forgot to mention, it is probably a grounded-grid design (don't see any
input tuning).  Underneath, there should be two long ferrite transformers
connected between the filament transformer and the filaments of the 813's.
If there are, the circuit is a grounded grid linear amplifier.  You should
be able to find circuits for the amp in the 1960's ARRL handbooks or the
Editor and Engineer's handbooks.

73 de Bill, ab6mt
hbco2 at sbcglobal.net

----- Original Message ----- 
From: "Bow" <kd5kzn at sbcglobal.net>
To: "Discussion of AM Radio in the Amateur Service"
<amradio at mailman.qth.net>
Sent: Saturday, April 21, 2007 2:18 AM
Subject: [AMRadio] My Amplifer Quest took a strange turn today



Yup, I headed to the local Radio store to have my Yeasu 2 meter rig looked
at (no TX). I found it it is a dead-duck, probably the processor, it will
make a nice paperweight...

ANYWAY...

I'm talking with the owner about the fact I was looking for an amp, prefer
tubes, mainly for use on 75M and maybe 10M... Around 600-700 watts...

He thinks a bit and then rotates to his right and points up on the top
shelf...

"It was left here for a repair about 1.5 years ago, I got it repaired, the
guy never picked it up... It is set-up for 75M and 40M.. Pair of 813's...
Everything checks good on it, it’s a nice amp..

You can get it off my damn shelf for $75..."

I couldn't reach for my wallet fast enough...

Now the fun part begins... Can anyone ID it, or maybe point to a handbook
that is may have come out of so I can get a schematic??

Here It Is:

http://riley-music.com/BowsStuff/AMP/02Front.JPG

http://riley-music.com/BowsStuff/AMP/04%20RightSide.JPG

http://riley-music.com/BowsStuff/AMP/05LeftSide.JPG

http://riley-music.com/BowsStuff/AMP/06Rear.JPG

http://riley-music.com/BowsStuff/AMP/07PowerTranny.JPG

http://riley-music.com/BowsStuff/AMP/08CoilAndCaps.JPG

http://riley-music.com/BowsStuff/AMP/09_813a.JPG

http://riley-music.com/BowsStuff/AMP/10_813bChoke.JPG

http://riley-music.com/BowsStuff/AMP/11Interior.JPG

And Even though I have not fired it up yet, I did light off the filaments...
I think EVERY piece of tube gear should have a window...

http://riley-music.com/BowsStuff/AMP/12MagicInTheWindow.JPG

http://riley-music.com/BowsStuff/AMP/13Glowin813s.JPG


So, can anyone help me ID my score?!?!?

Bow

W5EFR

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