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Old 6th January 2009, 01:47 PM   #1
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Default Adding more power tubes and make a tube amp switching them?

Ive been searching ways to have EL34 6L6 EL84 to a guitar tube amplifier,and be able to change the outuput tubes and not stand-by the amp first.
Ive seen that the heater for each power tubes 6.3V for 6L6 is 0,9A each for EL34 is 1,5A each..So i guess that would overload the transformer,but with an external heater supply at 6,3V and the proper Amps to the multiple tubes and correctly wired would that work?

And if that would do,as about the switching between tube sets,
Ive noticed that a function of the Mesa Boogie mark IV is to "get the tubes out"by removing V6 and V7 pin 8 from the ground.

So a modification like that:connecting all power tubes with an external heater supply normaly,and then choose witch tube will work from a relay switch is theoreticly possible?
Connecting high voltage wires to all power tubes could cause a power transformer overload even if they are not currently used?

Thank you for your time in advance:
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Old 6th January 2009, 09:57 PM   #2
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Are you proposing to connect all the tubes in parallel,
and selectively heat only one active pair at a time?
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Old 6th January 2009, 10:38 PM   #3
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Quote:
Originally posted by kenpeter
Are you proposing to connect all the tubes in parallel,
and selectively heat only one active pair at a time?
I read it as wanting to heat them all with a seperate filament transformer and switch between tubes one at a time by lifting the cathode connections on all but one pair. And possibly doing it on the fly. Gheesh!
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Old 7th January 2009, 12:31 AM   #4
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Quote:
Originally posted by kenpeter
Are you proposing to connect all the tubes in parallel,
and selectively heat only one active pair at a time?
Im not sure what you mean "heat"...
If you mean the heater wire pin 2 and 7 of each power tube,im thinking to place another small transofmer 220V ac to 6.3V ac and the proper Amps to support all the tube sets because that so many power tubes will probably overload my stock power transformer,for example 2xEL34 2x6L6.
While playing the 6L6's,then with a relay choose the EL34's without going on standby first.

Ive thought of changing all tube pins from the main input of the PCB with a LOT of relay switches while have them all connected to the heater supply,but when and if i do that the sound will slow rise when switching power tube sets(as when leaving the stand by mode and entering normal mode).But that is the least desirable...
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