Guillermo,
I am not familiar with your model of VTVM. However,
most VTVMs in that era had nearly identical
schematics. The Heathkit IM-11, IM-18, IM-21 and
IM-28 had a similar tube complement: a dual triode and
dual diode.
Schematics for the IM-11 and IM-21 are on the
"bama.sbc.edu" website. You might also be able to
find schematics for the IM-18 and IM-28. The Heath
manuals would be good to find, also, because they
include a theory of operation.
73,
Dave W8NF
To: <amps@contesting.com>
Date: Sat, 26 Jul 2003 11:38:00 -0300
From: GGLL <nagato@arnet.com.ar>
To: Amplificadores Lineales <amps@contesting.com>
Subject: [Amps] A little petition, but Off topic
Sorry for this message being off topic, but
considering the
experience of the rest of the people in this list I
give it a try:
maybe
somebody can help me with an old piece of test
equipment I have; I own
(gift from my radio teacher years ago) an old VTVM, in
very good shape
and working, it's a Radio City Products model 657A.
The meter is 6.5"
by 4.25", very easy to read. Measures ACV, DCV both
upto 1500V,
resistance and capacity. Double triode (12A?7, don't
remember if T, U,
or X) and double diode (6AL5) inside.
Instrument faceplate says: Radio City Products. Co.
Inc., Easton, PA,
USA.
What I want to get is an operating manual with the
schematic for it,
can you help me with this, or a place where I could
get it, either a
manuals library, another list, or the Internet?
Thank you in advance
Best regards
Guillermo - LU8EYW.
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