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Tubelab Discussion and support of Tubelab products, prototypes and experiments

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Old 6th March 2017, 01:42 PM   #11
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Location: Holland, MI
I can but I am not sure how useful that will be as it is installed in a chassis currently so I can only snap a picture of the bottom side ... see attached.

As I mentioned prior, this is a clone of my unit which is working properly and has the exact same components on each board. The only difference is I added a switch to go from 2.5V to 5V filament, a volume control and of course different tubes (but we also have swapped tubes to rule that out as well).

FYI - You'll notice the wires running to the location of R18/R29 ... these run to a 10-ohm shunt mA panel meter (with the resistors removed) so we can set the bias visually without requiring a multimeter.
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Paradox DL-103R, P2-24, Pearl 2, Apollo-R, D100 Mk2, Mezmerize, TSE 45, ALK Klipschorns

Last edited by craigtone; 6th March 2017 at 01:45 PM.
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Old 6th March 2017, 05:04 PM   #12
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Join Date: Feb 2016
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I know that I and others had a problem with a connection between the two sides of the board that was diagnosed by Win W5jag as follows:

Also, the center pin of one of the 10M45's is used to pass voltage between the top and bottom sides of the board; if the solder doesn't plate through the hole, shenanigans occur. It's described on the last page of the 801A in Tubelab SE thread a page or two back.

Win W5JAG


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