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.
Search found 158 matches
- Thu Jul 03, 2025 7:21 am
- Forum: Transformerless VariMu
- Topic: Instructions, Schematics & Specs (NEW VERSION)
- Replies: 7
- Views: 335
- Mon Jun 23, 2025 3:22 pm
- Forum: Transformerless VariMu
- Topic: Instructions, Schematics & Specs (NEW VERSION)
- Replies: 7
- Views: 335
- Fri Jun 20, 2025 1:24 pm
- Forum: Transformerless VariMu
- Topic: Instructions, Schematics & Specs (NEW VERSION)
- Replies: 7
- Views: 335
Re: Instructions, Schematics & Specs (NEW VERSION)
Use heatsinks or mount regulators U1 & U2 on DC-DC PS board to chassis!
- Fri Jun 20, 2025 1:21 pm
- Forum: Transformerless VariMu
- Topic: Instructions, Schematics & Specs (NEW VERSION)
- Replies: 7
- Views: 335
Re: Instructions, Schematics & Specs (NEW VERSION)
Mount the sidechain board to front panel.
- Fri Jun 20, 2025 1:16 pm
- Forum: Transformerless VariMu
- Topic: Instructions, Schematics & Specs (NEW VERSION)
- Replies: 7
- Views: 335
Re: Instructions, Schematics & Specs (NEW VERSION)
Assembly and wiring.
Layout
https://ghr.fi/varimu2/schematics/layout.pdf
Use plastic standoffs under PS board -
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Layout
https://ghr.fi/varimu2/schematics/layout.pdf
Use plastic standoffs under PS board -
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- Fri Jun 20, 2025 1:12 pm
- Forum: Transformerless VariMu
- Topic: Instructions, Schematics & Specs (NEW VERSION)
- Replies: 7
- Views: 335
Re: Instructions, Schematics & Specs (NEW VERSION)
Mount the tube sockets with standoffs before soldering!
- Fri Jun 20, 2025 1:05 pm
- Forum: Transformerless VariMu
- Topic: Instructions, Schematics & Specs (NEW VERSION)
- Replies: 7
- Views: 335
Re: Instructions, Schematics & Specs (NEW VERSION)
Before populating the boards use main board, PS board & meter board to mark mounting holes to the chassis.
Populated boards
main1.jpg
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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.
psandmeter.jpg
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sichainfull.jpg ...
Populated boards
main1.jpg
-
U1 on power supply board should be mounted to chassis. U2 can be mounted to chassis or should have a heat sink.
psandmeter.jpg
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sichainfull.jpg ...
- Fri Jun 20, 2025 12:57 pm
- Forum: Transformerless VariMu
- Topic: Instructions, Schematics & Specs (NEW VERSION)
- Replies: 7
- Views: 335
Instructions, Schematics & Specs (NEW VERSION)
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/
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/
- Fri Jun 20, 2025 12:49 pm
- Forum: Transformerless VariMu
- Topic: New version coming soon!
- Replies: 23
- Views: 27924
Re: New version coming soon!
Specs and calibration instructions
https://ghr.fi/varimu2/specs.pdf
https://ghr.fi/varimu2/specs.pdf
- Fri Jun 20, 2025 12:46 pm
- Forum: Transformerless VariMu
- Topic: New version coming soon!
- Replies: 23
- Views: 27924
Re: New version coming soon!
Meter board had inputs in one opamp crossed. Pictures with new working meter board.