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Vintage threads from the first ten years

nice for parts, etc.

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6/7/2000 3:19 PM
kg	nice for parts, etc. http://cgi.ebay.com/aw-cgi/eBayISAPI.dll?ViewItem&item=352051703

6/7/2000 4:39 PM
Steve M.	ken, 100 watts is pretty optimistic for that amp don't you think? Steve

6/7/2000 5:42 PM

450vdc b+, UL connection, cathode biased, 6l6gc's--yeah, it IS a bit optimistic.

nice big PT iron though, a chassis to play with, and a UL opt.. it's worth more than the high bid right now, at least to me. i don't know the reserve, though.

incidentally, ned's got a schemo here:

http://www.triodeel.com/eicohf20.gif

still, you could get 70w out or more with fixed bias, no tube rec, and 6550's, especially if you go into grid current!

oh yeah, i've got no connection to the seller, etc.

kg

6/12/2000 6:06 AM

kg:

    You'd think that an Eico HF20 would be a 20 watt amp (especially with cathode biased 6L6's). I had a pair of Eico 35 watt mono amps which were each like half of a Dynaco Stereo 70. Wish I knew what the heck I did with them!

    As for the seller's reserve price you could get a friend to keep making bids until the reserve was met and then have him withdraw his bid... no problem as long as the negative feedback doesn't bother him.

    I overheard a conversation at a customer's house the other day about a transaction on ebay. Seems like the daughter had placed a $55 max bid on a doll that she had when she was young, and gee whiz she won the auction with her $55 max bid... I was busy working in the furnace closet so I didn't say anything but what is the chance that your maximum bid just happens to be the winning bid? I had a hunch that the seller had a buddy bid against her to see what her maximum bid was and then withdrew his bid, leaving her holding the bag and her $55 doll... Then again a lot of people will make their maximum bid a multiple of $25 so if you make your bid a little bit higher than that you just might win.

    But there is no sense drooling over the items being auctioned until the last 30 minutes. If the price is still reasonable you can then get your hopes up and hope to hell that you type your password right when making a bid in the final 10 seconds! (BTW any outstanding "proxy" bids will outbid you before the page is updated since they are made automatically... at least it seemed that way to me!)

--Thanks!

Steve Ahola

P.S. So what is it about tube hi-fi amps- why is the OT usually bigger than the PT?

6/12/2000 10:04 AM
Chris	BIG O.T. ++Steve Ahola P.S. So what is it about tube hi-fi amps- why is the OT usually bigger than the PT?++ I guess that's for a good bass-response , ( think Fender Bassman head ... ) Chris

6/12/2000 5:20 PM
SpeedRacer	It has do with the operating frequency. The core saturates more quickly at lower F basically, so a 50Hz power tranny will be bigger than a 60Hz.. this one reason that Aircraft run at 400Hz.(smaller, lightweight magnetics) An audio tranny (decent Q) will handle 20Hz at full power, which entails being much bigger than a tranny whose full power is rated at 60Hz (like a power tranny).

6/12/2000 7:20 PM

Re: BIG O.T./Peerless !

That output tranny in the picture is likely a Peerless. They were used by Eico, Heathkit and others in the Hi-Fi Days. Keep in mind, it being potted, the actual core and windings are 1/2 to 2/3 of the pot, and the balance is potting tar. There are also some Eicos that used Acrosound iron (precursor to Dynaco) that were ecellent as well. I rebuilt some early Woodside, N.Y. built Ampegs that used Peerless and/or Acro outputs and they were and (are) excellent quality iron. Likely a little cleaner than many guitarists might like. The choice of core materials in guitar vs audio tranny's tends to lean more towards easier saturation. This info was offered to me by Mike LaFevre at Magnequest, who makes trannys for (amongst others) Allesandro.

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