Hoffman Amplifiers Tube Amplifier Forum

Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: mikhett on January 22, 2021, 05:57:50 pm

Title: RR Blackvibe schematic error?
Post by: mikhett on January 22, 2021, 05:57:50 pm

I'm attempting to build RRS BLACKVIBE 6V6.I BELIEVE their is an error in the power supply.Why would the positive of C1 filter cap connect to Negative of C2 filter cap? Is this a voltage doubler arrangement? Thy

Title: Re: RR Blackvibe schematic error?
Post by: shooter on January 22, 2021, 06:00:26 pm

a picture is worth a 1000 words

Title: Re: RR Blackvibe schematic error?
Post by: tubeswell on January 22, 2021, 06:04:33 pm

Who knows? It's possible Mr Robinette's schematic has an error on it. I had to google 'RRS Blackvide 6V6', and there are a few images that come up. If we had a copy of the schematic, we could assess the situation.

Title: Re: RR Blackvibe schematic error?
Post by: sluckey on January 22, 2021, 06:20:13 pm

Nothing wrong with that. The caps are in series which increases the voltage rating.

Title: Re: RR Blackvibe schematic error?
Post by: PRR on January 22, 2021, 09:54:53 pm

> Why would the positive of C1 filter cap connect to Negative of C2 filter cap?

The PT and rectifier make 465V (more at start-up). Electrolytic caps only go to 450V before they get unreliable or real expensive. A LOT of tube amps start from a series-stack to get past 450V safely.