Bottlehead Forum

Bottlehead Kits => Legacy Kit Products => Foreplay III => Topic started by: najo49 on May 30, 2013, 07:34:37 AM

Title: Shunt regulator question
Post by: najo49 on May 30, 2013, 07:34:37 AM

I removed the middle tube in my extended foreplay and noticed that music played even with it removed. Is this normal? Thanks jan Olsen

Title: Re: Shunt regulator question
Post by: Doc B. on May 30, 2013, 07:53:14 AM

You have defeated the voltage regulator by removing the tube. It is in parallel with the power supply, so the power supply will still supply voltage to the tubes. However you will find that the B+ at the inputs of the PC boards for the outer, preamp tubes is too high since the regulator is no longer controlling it. Running without it could require the C4S loads on the preamp tubes to dissipate too much excess voltage and they could run hot.

It also won't sound as good without the regulator.