RE: 12bh7 substitution in pilot sa 260

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Posted by Neff on February 27, 2012 at 20:29:12

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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Follow Ups Full Thread

Topic - 12bh7 substitution in pilot sa 260 - pennyford 07:59:20 02/26/12 (14)

RE: 12bh7 substitution in pilot sa 260 - pennyford 18:23:23 03/3/12 (0)

RE: 12bh7 substitution in pilot sa 260 - Eli Duttman 18:06:38 02/27/12 (0)

RE: 12bh7 substitution in pilot sa 260 - Cleantimestream 11:06:11 02/26/12 (11)

RE: 12bh7 substitution in pilot sa 260 - pennyford 18:57:32 02/26/12 (10)

RE: 12bh7 substitution in pilot sa 260 - Cleantimestream 00:13:40 02/27/12 (5)

RE: 12bh7 substitution in pilot sa 260 - pennyford 04:48:51 02/27/12 (4)

RE: 12bh7 substitution in pilot sa 260 - Neff 02/27/1220:29:12 02/27/12 (0)

RE: 12bh7 substitution in pilot sa 260 - Tom Bavis 08:14:14 02/27/12 (2)

Rectifier substitutions in Pilot SA-260... - Interstage Tranny 14:21:38 02/27/12 (1)

RE: Rectifier substitutions in Pilot SA-260... - Eli Duttman 17:26:20 02/27/12 (0)

RE: 12bh7 substitution in pilot sa 260 - Eli Duttman 19:10:59 02/26/12 (3)

I think the answer is yes - Tre' 10:06:08 02/27/12 (2)

I think the answer is ? - Interstage Tranny 14:04:19 02/27/12 (1)

I messed up, again - Tre' 16:07:42 02/27/12 (0)

Follow Ups

RE: 12bh7 substitution in pilot sa 260 - Neff 02/27/1220:29:12 02/27/12 (0)

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