#16
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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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#17
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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? |
#18
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Mistake on Mini-manual!
None of my Porta-Colors came through with Mini-Manuals. Only the newer solid state models had them.
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#19
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Mine did NOT have the mini manual.😡☹️ I’m going off of memory on the CRT, so I could be wrong on the number. It’s also entirely possible this isn’t the original tube, as I bought it restored from a guy who says he was an authorized service technician when these were on the store shelves. I’m familiar with 12ax7’s and the like, compactrons are new territory for me.
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#20
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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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Audiokarma |
#21
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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. |
#22
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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. |
#23
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It’s just gonna be awhile before I have the numerics down. I can tell what a gz34 or 6973 does off the top of my head. Been reading up on concepts I didn’t need to know before like convergence and sync too. Thanks to a pm here I have another working set on its way to me; you guys are great! Keep the good stuff coming.
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#24
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Quote:
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#25
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There were/are some compactron based audio amps, but not many.
__________________
Tom C. Zenith: The quality stays in EVEN after the name falls off! What I want. --> http://www.videokarma.org/showpost.p...62&postcount=4 |
Audiokarma |
#26
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Weren't you thinking of Novar based tubes, 7868 RCA's answer to the 7591?
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#27
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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.
__________________
Tom C. Zenith: The quality stays in EVEN after the name falls off! What I want. --> http://www.videokarma.org/showpost.p...62&postcount=4 |
#28
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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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#29
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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. |
#30
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Quote:
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Audiokarma |
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