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Post new topic power transistors in sessions 400
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Author Topic:  power transistors in sessions 400
Patricia Goins


From:
Michigan, USA
Post Posted 7 Jan 2018 7:18 am     Reply with quote

Does any one know if all six of the power transistors are of the same value on the sessions 400 ? going to change them, the old RCA ones some are different, 62188 J 7710, 62188 cv 1514, are these of the same value? Regards Jim Goins
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Dennis Detweiler


From:
Solon, Iowa, US
Post Posted 7 Jan 2018 8:24 am     Reply with quote

Does anyone know if they should be changed after many years of use? Should their values be matched? Upgraded?
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1976 Birdseye U-12 MSA with Telonics 427 pickup, 1982 U-12 Zum with Truetone pickup wound 18K, Revelation Preamp, TC Electronic M-350 Processor, Carvin HT 400 Stereo Rack Head, 15" Eminence EPS-15C, ShoBud Pedal, 1949 Epiphone D-8. And, too much extra gear.
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Dick Sexton


From:
Greenville, Ohio
Post Posted 7 Jan 2018 12:44 pm     LTD/Session 400 Diagram Reply with quote

This shows them the same. A call to Mike Brown would confirm... Happy New Year!

http://music-electronics-forum.com/attachments/42197d1485572163-ltd-400-probs.png
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Steven Paris


From:
Los Angeles
Post Posted 8 Jan 2018 9:16 am     Reply with quote

LTD 400 power transistors are Peavey# 62188--same as a 2N3773, available here:
https://www.mouser.com/productdetail/on-semiconductor/2n3773g?qs=sGAEpiMZZMshyDBzk1%2FWi%2FPUgtclNldlz27ZQ8uxym8%3D
Power transistors don't usually "wear" like tubes do, so there's no reason to change them unless you have a problem. BUT if you want to "upgrade" them a more robust transistor would be the ones used in the PV Nashville 400--a MJ15003---it has more maximum power dissipation (250 watts versus 150) and more maximum collector current (20 amps vs 16) and available here:
https://www.mouser.com/productdetail/on-semiconductor/mj15003g?qs=sGAEpiMZZMshyDBzk1%2FWi%2FPUgtclNldlRd9fQeXRL0k%3D
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Emmons & Peavey
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