Reliable & normally priced Korean sockets, good contact and they don't become loose after tube rolling. There are fake Belton circulating also, better buying them from known tube vendors or guitar shops.
Yes I bought from reliable sellers, very good and strong contact between valve & socket. It's a pity don't make loctal socket.
Why you made it once more? DAC output stage? To just try different passive components or to use the first build in a general line level preamp chassis?
Is this new build with some other parts subjectively any different to the first build?
Yes analog noDac output stage.
It's only changing parts, first to use only one resistor @ cathode & NFB, 2nd to see if new parts improve sound (1st time using Ohmite Audio Gold 12W at cathode) used CMF @ NFB because can't get my favourites RN60 or RN65 and to use the more aproximate schematic values, also new R-Core reaching 330V for B+.
Possible a lot of changes to know how impacts the sound of each one but improved the SQ.
As you can see there are 4 FT3 caps at the output doing a crossfeed for HD600.
I do not exclude in the future use it as preamp.
N.B. When used before the 6V6 G3X NFB not used the crossfeed so still can compare, I will take off the the crossfeed & listen.
P.S. Sorry for my bad English guys.
It's only changing parts, first to use only one resistor @ cathode & NFB, 2nd to see if new parts improve sound (1st time using Ohmite Audio Gold 12W at cathode) used CMF @ NFB because can't get my favourites RN60 or RN65 and to use the more aproximate schematic values, also new R-Core reaching 330V for B+.
Possible a lot of changes to know how impacts the sound of each one but improved the SQ.
As you can see there are 4 FT3 caps at the output doing a crossfeed for HD600.
I do not exclude in the future use it as preamp.
N.B. When used before the 6V6 G3X NFB not used the crossfeed so still can compare, I will take off the the crossfeed & listen.
P.S. Sorry for my bad English guys.
With headphones only, a couple of years of more without using the Borbely mono power amps, I listen like small exlosions but not all the time: are time spaced but constant, I refoamed the big AC mains filter bank capacitors without success, voltages are OK, any idea can help me?
TIA
Felipe
TIA
Felipe
I never had examined Borbely amps I can't help. Maybe open a help repair Borbely mono power amps thread?
Wild guess: Does it have DC servo op-amp? Try different if it has. Because you say there is a regularity in the explosive noises you hear.