Converting 100 watt to 50 watt amp?

[makeuacaster]

I've read/heard that you can take out two tubes in a push/pull 100W amp and safely turn it into a 50W amp.
True?
Which tubes? (two inside or outside?)
And should I change the speaker connection from 8ohm to 4 ohm?

 

[thunda1216]

pull either the inner pair or the outer pair, and select an output with 1/2 the ohm rating of your speaker

ty

 

[stokes]

What amp are you talking about? You can pull one tube from each side of the OT but you must change the load in the other direction.For instance,if you have 4 tubes going into a 4ohm load with 2 tubes you want an 8ohm load.Its not a bad idea to check the bias as well.

 

[212Mavguy]

Stokes is 100% right on. It pays to know how the tubes are paired... before pulling a pair, consult the tube chart for your amp if it has one. I have seen 4 power tubes arranged inner and outer, other designs are paired side by side for each pair. Peace.