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In Reply to: RE: New Mac gear(to me). posted by sberger on June 14, 2017 at 21:53:55
of resto are you doing with the Mk IIIs? Staying 'original' or updated boards? Nice amps which can be great with careful part selection. Should be an interesting A/B with the Mac.
Actually, they were restored by the previous owner. Here's what he did:
Got rid of the 5AR4 rectifier for solid bass with snubbed diodes
Put two computer grade Mallory Electrolytics in series to eliminate the ubiquitous problem of the MKIIIs self-destructing as their turn on surge in stock form over shot the filter capacitor voltage maximum by 20%!
Regulated B+ with series pass device
Regulated grid bias
Adjustable bias level and balance
Teflon power tube sockets
5 way binding posts
1% and 5% resistors in critical areas
Frako and Jensen electrolytics for bias and screen supplies
Aselco film and foil coupling caps
Unfortunately, in shipping them to me in California from Eastern Canada, they took a beating(they also weren't packaged properly...he didn't remove the tubes for one) and so when I plugged one of them in, it blew fuses. Brought them to a well known local tech here in the Bay Area, where they have been since early April, with promises that they will get fixed. Not sure why it's been so difficult for the tech, who is considered quite good, to repair these, other then his explanation that without a schematic he's having difficulty figuring out exactly what the previous owner did(yes, I have given him the bullet points that I printed above). But 3 weeks ago he said he could fix it, and it would "only be about another week"...I plan on giving him until second week in July before contacting him again, when it will be 3 months since he got them. He is very busy with a long waiting list, but if I can't get some definitive answers I'll just take them back and figure out my next move.
Anyway, you asked.
patience is a virtue, though not always my strong point.
If you're not in too deep, and/or if you decide to take a different direction, there're great kits that will easily drop in, including VTAs octal versions for 6SN7 drivers, -a personal fave.
Oh I'm plenty patient, which is why I'm leaving him alone. I have a great system in place right now, with no desire to change anything. It's really more of my consumer advocate/customer service side that would like folks to be a little more service oriented. Send an email or call if what you told me turns out not to be true. Just a simple update. But I also understand in this business, particularly when one is dealing with folks that don't necessarily come from that background and have plenty of business(maybe overwhelmingly so) to go around, one has to be tolerant. Which I am.
If they don't get fixed, I'll sell them as is and be done with them. The original seller already refunded me a fair amount, so I won't be taking a bath. But I hope they get brought up to speed because I'd love to hear them with my Cornwalls.
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