Carver M 1.5t recap and RCA

[jeffrowland]

My original Carver, as it arrived from the United States over 30 years ago. the only modification that can be seen is the power cable and the plug, because it was fitted with the American one.

CAPS,

I remove the RCA and put the new ones in the same socket

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in these, which I just took, you can see the caps I used and positioned. I saved the S-bracket and used it to hold the two larger ones.
If I remember correctly, I did the recap in this period of 2024.
in my Carver there is always a hum coming from the power supply and apparently no one has ever figured out how to remove it.
thank you all

 

[jeffrowland]

updates, after recent readings and insights.
this morning with a borrowed multimeter I checked the bias values as seen in the XrayTony video and I was able to see that the two channels were not perfect and aligned. the right channel slightly higher and the left lower. 3.2mV right and 2.7mV to left.
aligned at 3.5/6mV I'm now doing a listening test.

 

[jeffrowland]

update,
as suggested by @anatech I redid the adjustment and once I had correctly adjusted (it wasn't out by much, it was at 124V) the power voltage at 118/119v measured at the big capacitors, I went back to the bias for the 3.5/3.6mV values. There's one thing I still don't quite understand - why in the video he replaces capacitors and resists the speaker sockets.

Bias current doesn't change with the supply voltage.

1. set supply voltages and let them become stable.
2. set bias currents, allow them to settle and correct as needed.

simple.

The dual capacitors should be replaced with something equivalent to the Carver factory replacement PCB. Capacitors on leads simply will not cut it, if that was done, take them out and do it properly. Note that Carver service never supplied the PCBs only, it was a complete assembly and I still have one (which will not be sold). I make exact duplicates for my own service use. The boards need the heavy pins, not skinny leads.

 

[anatech]

Why? Who knows? People can have ideas in their head that don't apply to reality sometimes. If he didn't give a reason, be suspicious.

I don't have time to watch videos, but those are a zobel network. Only damaged by high frequency oscillation. Capacitor types will not affect sound quality, or resistors. They are only there for stability, period. Maybe he broke them messing with the filter capacitors.

 

[jeffrowland]

yes, I thought a lot about the reason why he made that change of cap and resistances in that area.