Thanks Jim
Oh boy, yes T2302. I don't know why I said 2802, I guess that's what happens
when your old, tired and frustrated.
I figured that's where my 13.6 volts was going by following the schematic
but wanted to confirm it before I started dissecting T2303 to get to T2302.
I wonder if I could put a new lead to T2302 from the bottom side of the
card? At least that way maybe I could test it and see if I have to rewind
T2302 before removing T2303.
I'll have to study it and see how difficult this is going to be either way.
If someone has a good PA board they want to sell me I'm ready to buy one.
Steve w7jsc
--
From: "Jim Shorney"
Sent: Friday, March 21, 2014 8:14 PM
To: "J. Steven Cochrane" ; "drakelist"
Subject: Re: [Drakelist] TR7 Driver Stage on PA Board Questions
I assume you are referring to T2302, there are no 28xx parts on the PA
deck. I
suspect what you are seeing is one of the lead wires from T2302, which is
part
of the RF filtering system for the collector voltage to the drivers. It
looks
to be bifilar wound, so yes, a break in the common lead would kill 13.6 to
both
of the drivers. It looks like to get to it you would need to remove T2303.
Not
an easy task, but do-able. I don't have one in front of me, just looking
at SM
pictures right now. Once you can get to it, it shouldn't be a big deal to
either patch the broken lead or re-wind it.
73
-Jim
NU0C
On Fri, 21 Mar 2014 16:21:32 -0600, J. Steven Cochrane wrote:
I have two TR7 questions:
1. There is a VERY fine wire, like fuse wire, that runs next to T2802
toroid (side closest to the final amp stage), it is broken. Could that be
why I don't have 13.6 volts going to the Driver Transistors (there is 13.6
volts at the Test Jumper for the Bias Measurement)? The toroid doesn't
look all that good either, but neither does the one in my good TR7.
2. Does anyone know of an easy way to replace that wire and T2802 if
necessary?
If anyone has a working PA board they would like to sell I'm interested.
Steve
J. Steven Cochrane W7JSC
--
Ham Radio NU0C
Lincoln, Nebraska, U.S.S.A.
TR7/RV7/R7A/L7, TR6/RV6, T4XC/R4C/L4B, NCL2000, SB104A, R390A,
GT550A/RV550A,
HyGain 3750, IBM PS/2 - all vintage, all the time!
"Give a man a URL, and he will learn for an hour; teach him to Google, and
he
will learn for a lifetime."
HyGain 3750 User's Group - http://groups.yahoo.com/group/HyGain_3750/
http://incolor.inetnebr.com/jshorney
http://www.nebraskaghosts.org
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