[AMRadio] B&W 5100

Jim Wilhite w5jo at brightok.net
Fri Jul 5 08:53:24 EDT 2013

Rob, my 500A makes about 1100 watts peak power with the stock iron.  The
trick to make it sound good is not try to push them into territory where
they can't go.  I see about 95% negative and 95% or just a bit more positive
modulation out of mine with pretty balanced tonal qualities.

As Don pointed out, remove the couplates then play with the audio stages to
get it to sound the way you want it without overdriving the lower end or
trying to get 125% on the positive, it won't do that.

It makes for good quality communications audio using the crystal element
D104 and people comment that it sounds good.  I have an EV 638 that I put on
it and people said the 104 sounds better as the EV adds a bit too much base
for them.  I gave up and leave the 104 attached, that is when I get on the
air nowadays.

The B&W 5100 doesn't have couplates and can sound good too but just a few
component changes.



> ----- Original Message ----- 
>> my experience hearing them on the air has been that most GK500s need
>> all the audio they can get.  maybe bigger mod. iron too.  But it may
>> also be that the audio tubes including the 811As get tired after 50 or
>> 60 years and the owners don't replace them.
>> 73
>> Rob
>> K5UJ
>> On Thu, Jul 4, 2013 at 11:17 PM,  <w8au at sssnet.com> wrote:
>>> Don mentioned the RC coupling replacement for the couplates in the GK
>>> 500....
>>> The improvement is positive, but it also increases the gain through the
>>> audio chain.
>>> Had to keep the input pot about 2 on a scale of 10 when using the D-104.
>>> Perry

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