-----Original Message-----
From: km1h@juno.com <km1h@juno.com>
To: amps@contesting.com <amps@contesting.com>
To: <amps@contesting.com>
Date: Sunday, September 13, 1998 12:04 PM
Subject: Re: [AMPS] Augmenting SB-220 power supply
>
>
>On Sun, 13 Sep 1998 12:18:10 -0500 "Bob Hutchinson" <bhut@nol.net>
>writes:
>>
>>This is a multi-part message in MIME format.
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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.
...an option is to bypass the middle man and get them directly from the
source--Digikey. They have the caps, diodes, MOF resistors, etc..
>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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>>
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>>
>>
>
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