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toroids

Another way is to use toroids that are normally used as power transformers. They are quite cheap from Antek.

Once you work out your load, use the following equation to determine the one you require. For example, if you wire the 115 volt primaries in series and the 9 volt secondaries in parallel you would get 5224 ohms for an 8 ohm load.

((115+115) * (115+115) / (9*9)) * 8 = 5224

I am not suggesting that 5224 is a suitable load for a GM70. It is just an example for the equation.

The transformers sound confused to begin with but eventually they break in and become quite listenable. You could get your amp working with the inexpensive transformers ($11 for 25 watt, $17 for 50 watt), try them out for a while as you adjust your amp and eventually move to more expensive iron when you make up your long term decision about operating point.

ray



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