Instructions, Schematics & Specs (NEW VERSION)

[Heikki]

If you want to buy boards send me a PM or email

Schematics & Layout
https://ghr.fi/varimu2/schematics/

Calibration instructions
https://ghr.fi/varimu2/specs.pdf

Front Panel Designer file
https://ghr.fi/varimu2/varimu3Ughrrotarybigboard.fpd

BOM
https://ghr.fi/varimu2/bom/

[Heikki]

Before populating the boards use main board, PS board & meter board to mark mounting holes to the chassis.

Populated boards

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U1 on power supply board should be mounted to chassis. U2 can be mounted to chassis or should have a heat sink.

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[Heikki]

Mount the tube sockets with standoffs before soldering!

[Heikki]

Assembly and wiring.

Layout
https://ghr.fi/varimu2/schematics/layout.pdf

Use plastic standoffs under PS board

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[Heikki]

Mount the sidechain board to front panel.

[Heikki]

Use heatsinks or mount regulators U1 & U2 on DC-DC PS board to chassis!

[Heikki]

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[Heikki]

This is the type of tube socket I recommend using.
https://www.tubetown.net/ttstore/en/soc ... leads.html

If gain reduction LEDs light up too early change R150 & R151 on the sidechain board to 12k or 15k.

[Heikki]

Don't use the old mastering modifications with this new version!