lots of money for ---uhm what exactly?

An attenuator kills power tubes the Dumbleator cuts the preamp signal with out sound degradation But you must have an effects loop from the end of the preamp signal to the phase inverter
Look at the back of SRV SSS-150 watt 1/4" jacks to the right the left ones are speaker outs.SRV SSS-150 back.jpg
 
YOu can get a Panama with a built in Attenuator..... for a lot less........
PG-ROAD_MORA_H22.jpg
 
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