On Sun, 13 Sep 1998 12:18:10 -0500 "Bob Hutchinson" <bhut@nol.net>
writes:
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>I notice that Peter Dahl has for sale replacement outboard
>transformers for
>the SB-220 that produce twice the normal 1A. current. The prices are
>not
>exactly Coke money. I have a couple of SB-220s and am about to come
>into
>more parts, including transformers.
I need an original xfmr in case you want to sell one.
>
>Is it feasible to improve of the current capability of the SB-220
>power
>supply by connecting two of the standard SB-220 transformers in
>parallel?
The stock xfmr will run fine in non-contest or RTTY modes. Increasing the
I rating gave them a bit better survivability in contests but the SB-220
is pretty much passe for that use today...at least DX contests unless it
has 160M added.
Outboard xfmrs with higher voltage just increased the possibility of
bandswitch failure.
The CBers buy a lot of the big Dahl xfmrs for that amp and even change or
add tubes.
>Perhaps with an outboard transformer augmenting the inside
>transformer.
>Would this technique provide a more robust power supply input
>capability?
>What would the ramifications to the rectifier, filter and other
>components
>be?
The stock rectifiers should be changed to 1N5408's in any case....or just
buy a new updated PS board from Harbach Electronics.
Measure the voltage drop across each filter cap, they should be well
within 5% total with those 30K equalizing resistor. The Harbach Capacitor
Upgrade uses matched computer grade caps and 100K resistors....lots less
heat and you save 30W of constant current drain in the SSB
position.....that will give you another 60-100W of PEP overhead in the
xfmr.
73 Carl KM1H
Amplifier Repairs and 6M Conversions Our Speciality
>
>Bob Hutchinson N5CNN
>bhut@nol.net
>
>
>
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