Hoffman Amplifiers Tube Amplifier Forum

Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: kagliostro on September 27, 2017, 02:06:02 pm

Title: JVM410 - Voltage on nodes ?
Post by: kagliostro on September 27, 2017, 02:06:02 pm

Does someone knows which are the voltages on the nodes (HT1 - HT2 - HT3 - HT4 - HT5) of the JVM410 ?

Thanks

Franco

Title: Re: JVM410 - Voltage on nodes ?
Post by: tubeswell on September 27, 2017, 03:23:36 pm

This amp?


https://marshallamps.com/products/amplifiers/signature-series/jvm410hjs/ (https://marshallamps.com/products/amplifiers/signature-series/jvm410hjs/)


To squeeze 100W out of 4 x EL34s, I'd say the plates are running between 480 and 500, with the screens 8 or nine volts below that. So the B+ is close to 500 methinks. The rest you can surmise from looking at any classic Marshall 100W schematic. What do you think?

Title: Re: JVM410 - Voltage on nodes ?
Post by: kagliostro on September 28, 2017, 07:28:23 am

Yes Tubeswell that amp

Thanks for the answer

(a friend is looking to the preamp voltages as he want to replicate a part of the preamp)

You have a PM

Franco