Luxman L435 Capacitor Query

[40 watt]

I have a Luxman L435 and I just put all new electrolytic capacitors in it. I managed to hit exact values for all of them except one, the little 0.47uf 50V cap as cicled in green on the attached schematic close-up. Capacitor C7113.

I didn't have that exact value but put in 1.0uf 50V Nichicon KW as it's the closest I had on hand. I DO have a 0.47uf 100V polyester Wima MKS2 as the only exact value for that on hand.

Question: Do I leave in the now new 1.0uf 50V Nichicon KW or use the polyester? [golf pants ]

Thanks!

Schematic capture:

[DuncanV]

Check out the TA7317P's datasheet. Looks like this value is not that critical. I'd keep the 1uF

[40 watt]

Thanks! I have left in the Nichicon KW 1.0uf 50V there. I was worried if it was part of an RC filter for a filter of critical nature like low pass or high pass.

So...All the electrolytics are changed, circuit board[i] inspected and cleaned. I cleaned all the Alps PCB pots with contact cleaner and followed up with Deoxit Faberlube. They feel nice and smooth now.

Capacitors all from Digikey: Panasonic THA 105 degree 15000uf for main filter caps. Oddly, the Panasonics have a stated ESR the same as a Mundorf.

2 of those for $25 and all the other capacitors, Elna Silmic II's and Panasonic FC's came to another $25 so not too bad of a hit, yet. A worhty investment so far, on top of the $50 to buy the amp in the first place.

Anyhow, before I fire it up I read through Saki's vintage amp tutorial and with regards to my Luxman L-435 there are two variable resistors, VR7101 AND VR7102.

Question for those more knowledgeable than me: Are these two variable resistors [1K volume controls on parts list of schematic] for adjusting output DC-offset between channels or are these variable resisitors trimmers for bias adjustment? I haven't touched 'em yet

If they are DC-Offset adjustment, I think Sakis mentioned to do it with no load. So........................let me run this by you: multimeter probes on speaker outputs? 200mv setting? Would the no-load [if even appropriate?] mean no resistor between speaker outputs? Or would I need a resistor across the speaker terminals to simulate a load? I think I read that somewhere too. So....confusione.

Attached portions of schematic relevant. If I have the flow right the variable resistor appears to head off to Final Stage. Which cofuses me because it appears in my mind that these trimmers could also be bias adjust for for whichever appropriate output devices? If so it seems that a multimeter could get ballpark on that adjustment?

The trimmers are circular and the tops have a white plastic outer cover on top with slots on top in a cross pattern. I'm worried they might be VERY sensitive [especially if not a multi-turn variety] and I don't want to eff with 'em without a reasonable forecast[ in advance yet] of possible outcomes:

[40 watt]

Another piece of puzzle:

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Another: the green arrow on the first capture is the pathway that connects with the image below involving that trimmer:

[llwhtt]

Can you post the portion of the schematic showing the pots in question?

Craig

[40 watt]

Yes, I just modified the post above yours to contain an annotated portion of the schematic with the part #. It is now circled in green and the exit [or entry?] pathway is also in green. The green line goes off to [or comes from?] the first capture of the schematic in the current adjust and final stage. VR7101 and its twin VR7102.

[40 watt]

The pathway appears to connect with a 2SA1360 device on the schematic in forum post #3, with a couple of other pathways connecting in beforehand.

Amp is a Duo Beta L435, whatever Luxman meant by Duo Beta.

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Another pic:

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Another try for the right pic: