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In Reply to: RE: How high is "up"? posted by 1973shovel on January 20, 2016 at 07:43:56
So I stumbled across these items with the tuner buried in a new acquaintance basement yesterday. I'm not a collect, accumulator, or buyer and seller. They just wanted to get rid of them, but I advised someone out there would be interested in them, but not me. So I offered to try to sell the items for them. They also have a tube Fisher Counsel, but it is buried beneath stuff for the moment.
My objective is to reach out to personal friends to see if any of them would be interested. That is where I need a cost estimate so as to give them some rough guidance as to what they would be getting into ( I assume a possible fire hazard if run as if, even if they power up).
I don't know the tubes resale value, but I assumed the old Mullard EL84's and others alone have value. Bring 70 up on a Variac and everything looks great. Attached is a pic of inside of the PAS - pristine.
Thank you for the input.
Follow Ups:
I would replace (or suggest the buyer replace) the electrolytic caps in all three pieces. If the stock look is desired, then you're going to have to go with multi-section can caps for the B+. I've linked to one place below where you can get them (scroll down for the can caps). There may be other places which are cheaper. This is just to give you a ballpark figure of the costs.
The filament caps for the PAS, and the bias supply caps for the ST-70 can be purchased from DigiKey, Mouser, etc.
One other thing I'd consider a "must do" is the selenium rectifiers in the PAS and ST-70. Replacement diodes for those could go anywhere from pennies to a few dollars, depending on which diodes were used.
Be sure the correct value fuses are inserted in the FM-3 and ST-70 (no fuse was used in the PAS, but one should be added). While fire is always a possibility, I'd be more concerned about wrecking the output transformers in the ST-70. Next to the Mullard EL-34s and 5AR4, the output transformers are the most valuable part of the amp. That's why you want to replace the power supply caps (i.e. the can cap) as soon as possible.
Quite often the FM-3 and PAS used smooth plate Telefunken 12AX7s. Be aware that they can be quite valuable as well, so treat them gently, and, as you already voiced a concern, don't wipe off the stenciling!
How did the PAS stay so clean and the ST-70 get so dirty? Just because of the cover?
I would have the tubes tested first. Just because they are rare and valuable does not mean they may still be any good. And again, i would consider new rectifier tubes and do all the upgrades you mentioned.But test test test first before blowing out a pack of mullards!
Edits: 01/21/16
If I had a quad of Mullard EL34's (well actually I do!) I would buy some modern EL34 tubes to use while I sorted things out.
Dave
Mullards are a legendary tube. But truth be told there are several REALLY good new production EL34s now available. I was given a set of Shuguands (sp?) and was SHOCKED at how good these tubes are.
Personally I would store those vintage tubes for limited use. And get a good set for heavy duty listening use. I'm funny that way. I like to spare those oldies.
You give sound advice. I am planning on building an EL34 amp and will start with modern tubes, but I have to give the Mullards a try, just to see!
Dave
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