Recent content by therumour

Based upon what generally were stellar recommendations, I've had a not-so stellar experience with this vendor. You would think that an experienced shop would question the customer on what the toggle switches of as pedal are supposed to do, or at a minimum, use the internet to research (YouTube...

My experience... https://www.talkbass.com/threads/svt3pro-bias-setting.437406/post-29259783

Any response, really. I've read that you have to push the amp for the Tube Gain to react. I'm using one 8 ohm cab, and playing at a "moderate" volume. So my question was can tube selection (and placement) cause the Tube Gain to react at lower volumes.

I am wondering if a tube swap would change the "Tube Gain" control response on my SVT3-PRO. I've rolled the tubes when I bought it (decent quality, not necessary hot/aggressive). Does anyone know which tube sockets have the greatest influence on the Tube Gain control?

n.p.

np

Let the amp warm up for several minutes before testing. Be patient on each resistor - some would fluctuate ±4 mV while some only ±1 mV. I had to take notes then put it into a spreadsheet 😫

So, how I set my MOSFET bias (and perhaps unnecessarily complicate it, not unusual for me) was to measure each resistor in each column of four (looking front to back of the chassis). [Caveat: knowing what I know now, and starting out with resistors measuring 0.0 to 0.1 mV, I’ll pick one...

I missed that one... thanks for pointing me to the right place.

Thanks, that clarifies it for me. BTW, is that schematic available on the internet? (please DM me if you prefer.)

I have a question about V4 & V5... On the preamp board, the sockets are labelled J9/V1, J10/V2 and J11/V3. On the power board, they are only labeled J12 (closest to the front panel) and J11 (closest to the rear panel). So is J12 - V5 and J11 - V4?

The previous owner already did a tube swap: he included the five "old ones"?

While were on the SVT-3 PRO DIY... (and if this is not the proper forum for this, MOD please advise), please fell free to critique my choices for a tube "refresh". 2x TAD 7025 / E83CC REDBASE HIGH GRADE Selection 1x Tung-Sol 12AX7 New Production Preamp Vacuum Tube 1x Tung-Sol 12AU7 / 6189 New...

I found at the start that mine was already at 0.0 to 0.1 mV. So I took someone's advice (or ignorance) and turned the trim pot counterclockwise first - then worked my way uo My bad... untrained ears. :-(