W4KRL at arrl.net
Mon Oct 22 11:14:03 CDT 2012
Nice wiring job. Good luck on your auction.
73 Karl W4KRL
From: fgentges at mindspring.com [mailto:fgentges at mindspring.com]
Sent: Friday, October 19, 2012 7:25 PM
Subject: McIntosh Amplifier
Almost everyone that has sat at the tacos table has met Zac, KJ4BXT, one
time or another. He brought in his experimental home brew amplifier last
year seeking any good advice. I am sure he got lots from around the table.
Zac has been working at my lab over the summer on several projects. One
project has been the restoration of an early McIntosh amplifier.
Zac found there were a number of changes to the amplifier and worked to
rewire it to match the schematic in the Sam's Photofact. All the capacitors
were from 1954 so we ordered new film capacitors to replace them. Once
going the amplifier was tested with a distortion meter and dummy load.
Vacuum tubes were swapped out to get the best performance. The
potentiometers were replaced with new ones.
Zac took the amplifier home and did some serious monophonic testing see if
the amplifier was really as great as the legend. It was.
He used his camera and took pictures that were great and they are used in
the eBay listing.
We have listed it on eBay and we shall see how much this will bring. Past
amplifiers like this have brought some very serious money. Go to eBay and
search for item number 140870029206.
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