HW-12A, Power Loss

[Jerry Rego]

Before we begin, i just got through working on a mono bander and to know 
where I must start in helping you is ?  How are you measuring the output of 
the receiver ?  With a power meter.  Do you have a tube tester ? If so how 
do the finals check out ?  How does the input signal to the driver check out 
?  Bias dropping of or going high of remaing steady.  LMO Signal to xmit OK 
?  If you are only using the S meter for the P/O see if the resitor divder 
is OK. How is mike drive.  I just had a problem with mine - does output 
remaing steady on tune position.  THANKS AND WILL TRY AND HELP  JERRY KE7GG


----- Original Message ----- 
From: "Kent Kressenberg" <krkress at BELLSOUTH.NET>
To: <HEATH at LISTS.TEMPE.GOV>
Sent: Wednesday, April 29, 2009 17:57
Subject: HW-12A, Power Loss


I have a very nice HW-12A that rapidly lost output power, now has minimal 
output. Receive is okay. Replacement of driver and finals did nothing to 
correct the problem.
I am a little rusty on trouble-shooting this gear, as it has been quite a 
few years (a couple of decades, really) since I did much service work. So... 
I would appreciate suggestions, likely causes, first steps, etc to diagnose 
and fix this problem...  Thanks in advance... I know I'll get some great 
advice from this group!

73 de WB4SYU,

Kent

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