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 NEW  Matt presents bias and operation data for the 6V6 tube in SE operation - 6V6 Single-Ended (SE) Ultra Linear (UL) Bias Optimization.

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PostPosted: 29 Mar 2018, 11:06 
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Joined: 17 Mar 2016, 07:26
Posts: 29
Location: PrĂȘles, Switzerland
Hi all,

I'm collecting bit and pieces to make a tube preamp. It might be a Universal Preamp from Matt or an Aikido from John, I'm not sure yet. I have got a large stash of 6SN7 NOS so if I can get an octal PCB from John that would do it, sadly for now not available.

For my preamp, I will probably buy an aluminum enclosure large enough to host all goodies (PSU, remote control boards for input selection and volume control, amp pcb, etc) and separate them with appropriate shielding. The enclosure will have a front panel of about 40x13 cm.

I have ordered this Color LCD touchscreen VU meter from I like the idea of having something super-modern in front of a tube preamp.


I would like to afix it in the middle of the front-panel (will be precise laser-cut), so 4 screws and spacers would do it, but having screws near this nice display is somewhat ugly...

An idea I have is gluing screws or spacers nuts to the back of the front-panel using epoxy (I'm hacking boat stuff as well so I know how), with the screws towards the inside, where the evor display will be screwed onto. The mechanical efforts are small (touch-screen) so I'm sure it would be ok. Any other idea welcome...


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PostPosted: 29 Mar 2018, 12:09 

Joined: 19 May 2011, 05:38
Posts: 55
Hot Melt Glue?

PostPosted: 29 Mar 2018, 13:02 

Joined: 09 Oct 2012, 19:43
Posts: 381
Location: Vancouver Canada
I have done a few projects like this. What i do is secure the screen and associated parts to the back panel of the enclosure. (use standoffs if necessary). Just make the final height at the screen's surface to mate with the front cover when it is in place. This way the front is "screw free" clean but the screen itself is just as secure as it would be if screwed to the front panel. I usually draw a "side view pic" with each component drawn full size and placed in the cabinet of choice to make the figuring much easier. (Corel Draw) has been very useful for this.

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