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Rockola amplifer transistors
Posted: Thu Mar 06, 2014 2:02 pm
by clones
Hi
On the rockola amp driver boards from rockola 453 up to rockola 470 there are two transistors , one labelled as Q5 NPN 48929 and the other labelled as Q6 PNP 48932, does anone know what equivalent modern transistors can be used to replace them
regards
Clones
Re: Rockola amplifer transistors
Posted: Thu Mar 06, 2014 5:21 pm
by Ron Rich
Hi Clones,
Are there any markings on the transistor(s) itself ?
Ron Rich
Re: Rockola amplifer transistors
Posted: Thu Mar 06, 2014 5:39 pm
by MattTech
The numbering suggests they sound like RCA part numbers - but not sure.
Re: Rockola amplifer transistors
Posted: Thu Mar 06, 2014 5:45 pm
by Ron Rich
Hi Matt,
Probably not--- RockOla, as most jukebox makers, tended to use "house numbers". In Seeburg's case, this was done for QA and "stocking" purposes --I assume, the other companies did so for the same reasons ?
Ron Rich
Re: Rockola amplifer transistors
Posted: Thu Mar 06, 2014 9:43 pm
by Ken Layton
Yeh, those output transistors sounds like "house numbers" to me. Perhaps a real number is on the schematic?
They could possibly cross to NTE 130 (NPN) and NTE 219 (PNP).
Re: Rockola amplifer transistors
Posted: Thu Mar 06, 2014 10:17 pm
by clones
The only marking on Q5 is 48929 188 7452, Q 5 on the other channel is the same except the last four digits are 7413
Q6 is marked as 48932-1 188 7452, the schematic doesn't seem to give any more clues, i attached a copy of it
regrads
clones
Re: Rockola amplifer transistors
Posted: Thu Mar 06, 2014 11:30 pm
by Ron Rich
Hi Clones,
IF, I were a "betting man", and unless those were not in a T-220 "plastic pack", I'd bet that you will have no problems using TIP-31C, and TIP-32C, in that application.
Ron Rich
Re: Rockola amplifer transistors
Posted: Fri Mar 07, 2014 12:01 am
by clones
Thanks for the advice, they are ina a 220 case so I'll give those ones a try
regards
clones