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#1
09-08-2007, 12:53 PM
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Any common subs for a 12c5?
I have an admiral portable that i picked up on ebay. It uses series string filaments, and when i got it, the 12c5 audio output tube was broken. Would it be possible to use a 6aq5 if I rewired the socket and put a resistor in series with the filament string?
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This device isn't a spaceship, it's a time machine. It goes backwards, and forwards... it takes us to a place where we ache to go again. 
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#2
09-08-2007, 01:50 PM
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TDSL indicates that a 12CU5 might be a possible sub in some situations
http://tdsl.duncanamps.com/show.php?des=12C5 You can buy a brand new 12C5 from www.tubesandmore.com for $1.80 so why go with the jury-rig repair?
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all the best, mrh
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#3
09-08-2007, 02:27 PM
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I'm anxious to get it going as usual. I just ordered one, so now i will wait.
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This device isn't a spaceship, it's a time machine. It goes backwards, and forwards... it takes us to a place where we ache to go again.
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#4
09-08-2007, 03:48 PM
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What matters in a series string is that all the tube filaments draw the same current. a six volt difference in the string can more or less be absorbed, but in order to drop a 450ma-heatered 6AQ5 into a 600ma filament string you'd have to put a resistor across its heater to lower the resistance between pins 3 and 4 to 10.5 ohms. Across--as in parallel, not series. Then the string thinks its seeing a 6-volt, 600ma tube. Easy as scrambling the rest of the connections, but obviously doesn't even speak to the match of the tube to the OPT etc. A really, really squirrely quick solution to the problem when the only problem is the wait.
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tvontheporch.com
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