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Tube Gear - Preamps, Power and More! Bottleheads unite! This is the place to talk about that tubular gear of yours.

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Old 10-18-2009, 02:48 PM
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Socal Sam Socal Sam is offline
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McIntosh MC75 Nudies!

I've been chasing an intermittent gain problem so I had the bottom off to burnish the RCA jack. Problem solved, do far. While I had it open, I thought I would share a couple of photos.

The fourth photo shows the serial number. This is a 75-10xxx serial number which I understand is a 1961 production model. Wow, great sound perfected 48 years ago!




  #2  
Old 10-30-2009, 07:04 PM
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Socal Sam Socal Sam is offline
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A quick update on this amp. The intermittent gain problem kept coming back. At first, I thought it was a dirty and misaligned RCA jack. Then I re-soldered the ground wire from the pot to the chassis. Then I took a bigger swing and re-soldered a bunch of suspicious joints. Each time, the gain was normal afterwards only to ebb after a few days. This time, I checked everything and found that one of the original solder joints was touching the pot housing, which in effect was causing the input signal to ground. GRRRR...
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Old 11-02-2009, 12:27 PM
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Naknut Naknut is offline
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PITA no doubt but your persistence paid off.
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