[Johnson] Johnson Valiant Audio Driver Xfmr Replacement

[Robert Jefferis]

Bill,

I copied this out of the P.W. Dahl Amateur catalog. If it is the right one,
it might lend some insight:

JOHNSON VALIANT DRIVER XFMR
P/N 22.1286, T4
CORE) EI-062 X .75           STYLE #) 01  E-I LAMINATED CORE
PR) 230 OHMS DC (12AU7 AUDIO DRIVER PLATE)

S1) 800 OHMS CT (PP 6146 MODULATOR GRIDS)

DM) HT =  1.643 WT =  1.955 DT =  1.438 MD =  0.000 MW =  2.375
PRICE)    $120.00 Plus S&H FOB El Paso, TX    WEIGHT)    1  LBS

Good luck, Bob, KF6BC

-----Original Message-----
From: johnson-bounces at mailman.qth.net
[mailto:johnson-bounces at mailman.qth.net] On Behalf Of w0ng at comcast.net
Sent: Sunday, October 21, 2007 3:51 PM
To: johnson at mailman.qth.net
Subject: [Johnson] Johnson Valiant Audio Driver Xfmr Replacement

I'd like to ask the group for a little help in selecting the best
replacement for an interstage audio driver transformer in my Valiant
transmitter.
Hammond Transformer makes two versions of replacement xfmrs that should work
according to several reflector postings I've found posted over the years.
Opinions seem to vary as to which one will work the best. The specs are as
follows:

Model  / Watts / pri impedance / pri dc resistance / sec impedance / sec dc
resistance / sec winding
124D       5          7k ohms c.t.         454 ohms        15.8k ohms  c.t.
681 ohms           C.T.
124E       5         15k ohms c.t.        728 ohms      33.8k / 135k  ohms
3,880 ohms         C.T.  

I can't find the specs anywhere for the original audio driver xfmr in my
Valiant and would really appreciate some advice as to which one to use.
Thanks & 73, Bill, w0ng
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