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Might wanna take a look at http://www.audiokarma.org/forums/showthread.php?t=289952 :D

I was lucky enough to get a pair of MC75 monoblocks that for decades lay dormant in a shed after being decommissioned from a lab. I believe they came with the original factory equipped tubes. For the full story see http://www.audiokarma.org/forums/showthread.php?t=289952

http://www.audioasylum.com/audio/tubes/messages/21/212196.html perhaps?

here are some links you might find interesting: http://www.audiokarma.org/forums/showthread.php?t=264721 http://www.audiokarma.org/forums/showthread.php?t=392165 http://www.audiokarma.org/forums/showthread.php?t=399738

Don't forget cold solder joints, they are often a culprit, especially when going to ground.

LOL, it won't let you link the site? What's up with that? Also, wasn't there someone who bricked his pre last year with some FW update?

more on balanced circuits I was thinking that the MC275 reissue (MKIII perhaps?) had a balanced circuit, with an additional inverting buffer stage for single ended input (V1 in the attached schematic). Isn't that circuit balanced in the sense of cancelling common mode noise? Or is it simply...

One version of the MC275 had a fully balanced circuit. Anyone know off the top of their head which one?

Just to give you some examples of recently discussed models: MC60: Weight 46 lb. Sold from 1955-1961. Last retail price $219.00 MC240: Weight 56 lb. Sold from 1960-1969. Last retail price $288.00 MCD7008: Weight 24.5 lb. Sold from 1992-1996. Last retail price $2200.00 MR73: Weight 24 lb...

Here are my findings regarding the input (12AX7) and voltage amplification (12AT7) tubes with my vintage MC75 monoblocks: http://www.audiokarma.org/forums/showpost.php?p=5301114&postcount=1 http://www.audiokarma.org/forums/showpost.php?p=4991059&postcount=7 And here's something that takes...

Let's not forget http://www.roger-russell.com/clinics.htm, by Roger Russell.

Concerning the xformers' temp, here's what Mr. DeWick measured: http://www.audiokarma.org/forums/showpost.php?p=1869264&postcount=154

Hi Joe, Try looking here: http://akdatabase.org/AKview/thumbnails.php?album=5&page=3 Next time PM me ;)

When working with the turret boards in classic McIntosh amplifiers, be sure to mount new parts (usually resistors) to the same specs as McIntosh engineers did. A sturdy mechanical connection of a part ensures a secure and conductive solder joint later. It's not hard to do, looks neat and is...

Puzzling to say the least. Well, from the input...120VAC in, 3V dropped over the thermistor, so we can imo safely assume(!) that the transformers see a reasonable primary voltage. My estimate for the secondary voltage would be the following: The nominal voltage at the first capacitor is...

Hi, I just gave your measurements a quick glance. The readings are symmetric L/R throughout, which is good. Also, they are consistent. I would start looking for the cause elsewhere: How much voltage does the CL90 drop? What is the primary voltage right at the transformer? Am I correct...

http://seattle.craigslist.org/see/ele/3171864461.html :lmao:

If you hurry there is one on ebay right now. I sent you the link in a PM.

Here are my highly subjective findings on 12AT7 tubes: http://www.audiokarma.org/forums/showpost.php?p=5301114&postcount=1 I settled with the Sylvania 12AT7WA gold label tubes.

Hi, Usually I would first suspect out-of-spec resistors, but since you replaced them it's likely not the cause of the deviations you're seeing. Second suspect would be the caps (leaky caps), but as you put in new ones this can likely also be excluded. I remember reading in some service manual...

Nice find indeed :)

What would be a realistic price for a quad of original Genalex Gold Lion KT88 tubes? The labels on the tubes' socket are in very good condition (no wear/crumbling, thus no excessive heat I guess) and the getters are fat and shiny. The tubes are in (confirmed) working condition. Any input is...

The one with the small plates might look like a 12AT7, can we see a closeup?

First summer with tubes here too. I'm running chipamps on the really hot days. Currently an LM4780 in stereo configuration, Class AB iirc, dissipates very little heat due to its reasonably high efficiency. Class D amps may dissipate even less heat. Or a headphone amplifier ;-)

The blue glow is caused by electrons escaping from the anode and hitting impurities in the glass envelope of the tube. You can confirm this by moving a small magnet close to the tube and watch how the pattern changes when the movement of the electrons gets perturbed. A large change in tube...