Harbach PM-200

[kenth@totoket.com]

Guys,

Many thanks to all of you who have responded to this issue, really appreciated!

And dear Emil WD4SCZ, yes if you could magically find this schema somewhere in your archives and send it to me (kenth at totoket.com) that would be greatly appreciated.

As for your question Ed, K1ZOK, yes this is all very puzzling to me - the original R7 is from what I can see part of the chain of bleeder resistors for the caps....the "new" R7 in the Harbach I can't really figure out what it does....

Other than that it is vital for supplying HV to the tube anodes in some way....

The reason for the arching was that I had switched out the 572B for new ones, and not being careful enough when tuning up for test, one of the tank circuits came to close to the RF cage.....now THAT was a spark....

Apart from disabling the Harbach PS (R7) it also took out several resistors (R17 / R16? I don't have the schematics in front of me right now) and a diode in the ALC circuit too, which also doesn't make sense to me.

Anyways, many thanks for all your input - I'll keep digging.

73 de,
Kenth, W1JKP
Northford, CT



-----Original Message-----
From: ma.locksmith at juno.com
Date: 12/01/2009 09:28 AM
To: kenth at TOTOKET.COM
Subject: Re: [HEATH-TEMPE] Harbach PM-200

Are you absolutely sure the problem you had with arcing caused the
charring of R7?

The original resistor is rated at 7 watts....  this one is only 2.

Ed

On Mon, 30 Nov 2009 19:06:30 -0500 Kenth B Astrom <kenth at TOTOKET.COM>
writes:
> Gang,
> 
> Does anyone happen to have schematics for the Harbach power supply 
> upgrade PM-200 for amplifier SB-200 ?
> 
> I have a copy of the original schematics for the amplifier, but 
> after the upgrade, it doesn't seem to correspond in the power supply 
> area.
> 
> The upgrade has been working perfectly for over a year now, but the 
> reason I am asking is that I recently had some serious arching in 
> the amp and apart from a chain of components it took out, it also 
> completely charred resistor R7 (910 ohms / 2W) in the Harbach power 
> supply.
> 
> Many thanks in advance.
> 
> 73 de
> Kenth / W1JKP
> Northford, CT
> 
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