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Old 26th June 2008, 09:11 PM   #1
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Location: Tyrone Ga. U.S.A.
Default FS Hafler dh200 parts

I have a working dh200 that I am thinking about stripping. I will
sell the 2 circuite boards, filter caps and transformers for $30 +
shipping from 30290. Or I will let the whole amp go for $90 +
shipping. This add is only good through 7/1/08 .
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Old 27th June 2008, 01:10 PM   #2
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Which version of circuit boards do you have? Are they built on phenolic board or fiberglass/epoxy with through plated holes. Are the little caps mylar film or ceramic?

Can you post a picture? Or, what is the serial number of your amp?

Do your circuit cards look like this one?

Would you consider selling just the circuit boards, if they are working OK?

Thanks
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Old 27th June 2008, 03:31 PM   #3
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Cheaper boards like in the photo you posted. No I need to
get rid of the transformer ,caps and boards or the whole
amp. Once upon a time the amp was droped and the chassis
is warped a little so for the next 24 hours I will let the amp go
for $70 + shipping from 30290. I am posting this at 11:31 my
time so this offer expires noon 6-28-08 my time.
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Old 27th June 2008, 05:28 PM   #4
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Good luck on selling your parts. I love Hafler amps and already have all the parts except circuit cards so not interested.

Haflers represent a very good bang for the buck.
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Old 29th June 2008, 05:00 AM   #5
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$$ sent for the boards. More later when I receive them.

Thanks a lot.
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Old 29th June 2008, 12:52 PM   #6
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Dick just bought the boards so this add is CLOSED.

Thanks for the prompt payment Dick
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Old 29th June 2008, 08:30 PM   #7
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Keeping the heatsinks? I need a pair.
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Old 24th July 2008, 01:51 AM   #8
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Woody,

Thanks for the prompt service and good packing.

I finally got the two circuit cards installed and added a little DC nulling circuit to each. Now, they are running a pair of mono blocks and the sound is GRreeat!

You are a good man
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Old 11th November 2010, 07:25 PM   #9
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Was interested in your nulling circuit is it just like the schematic of the DH220?
RG
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Old 11th November 2010, 08:09 PM   #10
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No, it is much simpler. It was posted in The Audio Amateur by, as I recall, Walt Jung. Here is a text description:

==========
100K pot between the card's power supply rails and take its wiper, via a 2 meg resistor, to R3.

This is what Acoustat used in the TNT200 for DC Offset. A 100K Ohm, 1/4 watt variable resistor with a 2 Meg
Ohm, 1/4 watt metal film resistor should be fine, 1/2 watt would be even better, at about 4x the current capacity
you need. Place a film bypass cap across the trimmer resistor at the 60Vdc sides to reduce AC noise from the
power supplies.
=========

Here is a picture of it actually in use. Note the little square cermet variable resistor. I drilled several very small holes in the circuit to facilitate securing the variable resistor and wiring, then with just a touch of solder all was connected and held in place.
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