Rockola amplifer transistors

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clones
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Rockola amplifer transistors

by clones » Thu Mar 06, 2014 2:02 pm

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


Ron Rich
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Re: Rockola amplifer transistors

by Ron Rich » Thu Mar 06, 2014 5:21 pm

Hi Clones,
Are there any markings on the transistor(s) itself ?
Ron Rich

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MattTech
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Re: Rockola amplifer transistors

by MattTech » Thu Mar 06, 2014 5:39 pm

The numbering suggests they sound like RCA part numbers - but not sure.
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Ron Rich
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Re: Rockola amplifer transistors

by Ron Rich » Thu Mar 06, 2014 5:45 pm

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


Ken Layton
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Re: Rockola amplifer transistors

by Ken Layton » Thu Mar 06, 2014 9:43 pm

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).


Topic author
clones
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Re: Rockola amplifer transistors

by clones » Thu Mar 06, 2014 10:17 pm

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
Attachments
461-70arockola.JPG
amp schematic
(329.68 KiB) Not downloaded yet


Ron Rich
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Re: Rockola amplifer transistors

by Ron Rich » Thu Mar 06, 2014 11:30 pm

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


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clones
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Location: County Louth, Ireland

Re: Rockola amplifer transistors

by clones » Fri Mar 07, 2014 12:01 am

Thanks for the advice, they are ina a 220 case so I'll give those ones a try
regards
clones

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