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Tube DIY Asylum Do It Yourself (DIY) paradise for tube and SET project builders. |
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In Reply to: RE: 813 verses 4e27 who has tried both? posted by amnesiac on December 16, 2014 at 02:40:51:
Beofre thinking you have three, test them. Wire them up as zero bias triodes, light the cathode and apply voltage. If you don't get 200 mA by about 310 volts they are tired. They also may be gassy. I think I threw out about 2 cubic feet of gassy or otherwise bad 4E27's while I was gathering up supplies for my amps.
Said amps are PP, U-L and run 590V on a and g2 with a 10k a-a load with 115 mA idle per tube. given the OP, it is easy to see that they are running full Class A.
The amps are currently running 813's and are awaiting upgrade of the front end to an LTP of EL84's. Balanced XLR inputs.
cheers,
Douglas
Friend, I would not hurt thee for the world...but thou art standing where I am about to shoot.
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