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Transition Audio Design modded Altec 1570B

Tom Tutay took the case, iron, and output tubes and created a really georgeous amp. One iteration of the original was used to drive a garbage can sized servo motor--so it can drive your loudspeakers! Two 811 transmitter tubes in PP configuration putting out 170watts. Plates are powered by two EL 34s. In front of that, you will find a 6SN7, and then a 12AT7. Plenty of gain in this amp. I decided to use speakers with about 88db/watt efficiency--could never get horns to image well--and I don't have the space to put them. These amps give me the dynamics that horns/SET amps deliver, but with pinpoint imaging. Tom has made an old icon into a modern marvel
128x128jmwaite
mb3finder
4 posts
 

RIP Tom......

i didnt know Tom passed away . I did know he was having health issues . I called him up midyear 2023 to check up on him and also ask for maybe a copy of his written instructions on how to bias and balance my 1570 B altecs he got me ( circa 2000) . i have since lost hose papers and needed his help . needless to say , he wasnt able to help me and said that best bet is to find the " manual" .after speaking to him , i looked again and could not find the manual. sadly , after 20 years plus, i still havent biased or balanced the mono amps.( which i truly think is the best amps ive ever owned)

hopeful that this forum may help me out ......

thanks for accepting me into the forum.

tdrm
2 posts
 

Notes and schematics for my 2006 pair are posted at this link, along with the Altec article from Vacuum Tube Valley No. 7.

Cheers, Chris

 

https://spaces.hightail.com/receive/ftAgHUDUGz

mb3finder
4 posts
 

CHRIS, THANKS A MILLION!! i will have to approach very carefully before tinkering around as i know mine may be different from your pair!

jay

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