User181, anything you do is helpful to me. I can poke around a tube amp, but I’m just getting my feet wet in tv.
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I have an HD chassis that uses the 12JF5 and 17BW3, plus the 11WP22 and uses a 1DB3 HV rectifier instead of the 1AD2. If you check carefully, the chassis number might stamped on the HV cage. BTW, did you check to see if the mini-manual is in the small compartment on the back of the set? |
Mistake on Mini-manual!
None of my Porta-Colors came through with Mini-Manuals. Only the newer solid state models had them. :sigh:
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Got another clue; mine looks identical to a ‘72 model another member here sent me a photo of.
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I scrapped a 1970 set that had a 11WP22 from new, so the 11SP22 was from an earlier model. Compactron tubes are multi-section tubes that are really not that different than single or dual unit tubes that you're familiar with. Example: the 6AC10 is like a triple unit 12AU7. Looking at the schematic will help you understand. :thmbsp: |
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Yea. Consider Compactrons to be the electron tube equivalent of a silicon integrated circuit chip, in a way. Loosely equivalent in principle. |
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There were/are some compactron based audio amps, but not many.
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Possible, I tend to think of all (non-octal) tubes of that diameter as compactrons irrespective of their pin count. The one vintage amp I saw was in an organ...I don't remember the number and never pulled the tube.
Audiophiles are making amps with compactrons now as a way to use cheaper tubes. |
Since the conversation has shifted focus to compactrons, I guess now is the time to ask. Can you guys recommend a compactron tester I could find easily on fleabay? If one tube goes bad I don’t want to do the Christmas light trial and error thingy. Series string isn’t something you typically see on the hifi side.
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Re: the tube checker! A Sencore Mighty-mite or other modern tube checker that has Compactron and Novar sockets would do fine. I bought a full compliment of tubes for my PortaColors, except the 12JF5 for a buck each from ESRC, dollar-days list. For the damper tube I use a 19CG3 instead. It's a better tube and two extra volts in the heater string is better. :thmbsp: |
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