A small update here. Less time to spend on the B-2 as the girlfriend returned home after a 6 months lasting internship abroad. You know how it goes when the boss returns home
I had some time to re-mount the VFET's the proper way, with silicone (non conducting) thermal grease.
Also found a 'new' power switch, I actually stole it from my CT-600. I combined it with the well known Triac switch solution.
I also had to replace two components on the power board due to new insights. Replaced C222 with a PP film cap and TR216 with a new Zetex transistor.
And I installed some new CMC RCA sockets with new shielded wires for direct input in the driver boards. Again, the changes made are reversible.
Next up: reinstall the driver boards as is and fire the B-2 op. Exciting
YIKES!let's hope not like these:
YIKES!
Nice. Can we see a picture of the input jack board and how you managed that?
Great work!
I am using similar RCA's. Love the style and sturdiness.
Next up: reinstall the driver boards as is and fire the B-2 op. Exciting
Yes I know, but I'm a bit of an autist / perfectionist. See this pic, maybe you can guess why I put the red RCA's on top
View attachment 884823
yeah, can't blame you...dunnit myself once too for the same reason, but ended up regretting it 'cause later I was mixing the inputs. besides, your tops match but what abt the bottoms
could you please tell me the distance between the back of the PSU board and the underside of the cover...I guess measuring to the back plate lip....that is if your unit is still with the hood off.
I ended up moving bunch of those power resistors to the back of the board...same for the trimmers..I guess I should have worried about the distance before
or I could measure the distance from another unit, but I am just lazy...crap, it looks like is gonna be close.
Great jobAn (for me major) update here. I installed the driver boards as-is, wired the RCA's straight to them.
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After that I triple checked everything and went for the first power-up.
I was a bit nervous obviously.
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Dialed the bias pots fully CCW, hooked the meter on the +85 rail and fired it up....
Clang!
That was the relay, nice. +85 and -85 were 0,5 V off, adjusted them to +85.
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After that I dialed in the bias pots without a hassle to 50 mV and the DC offset to 0 mV.
Re-checked the same values and it was still OK.
So I hooked the B-2 to my C-4 and went for a listen session.
Man, what can I say, Steely Dan in the room
View attachment 889638
Next up: the driver boards and the meter board.