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In Reply to: RE: 12bh7 substitution in pilot sa 260 posted by pennyford on February 27, 2012 at 04:48:51
One tube can make or break an amp. The first tube I go after are 12AU7s & I am sure to some I sound like a broken record.
As for transformer heating the percent of current increase is important. With 6 amps already needed for the power tubes, the percent increase is minimal. 3. amp x 6.3 volt increase is a tiny 1.89 watts. That is so small that your transformer is better with that load increase vs a 100 degree ambient environment. And, the transformer will survive both situations at the same time.
On the other side a 6.3 volt @ .6 amp winding maxed out and adding .3 amps or 50% more load is a large percent increase and may overheat the winding to distruction.
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