Yaqin MC-5881A amplifier improvements

[CityPooh]

Originally Posted by CityPooh

After a month of using ancient NOS Canadian-W.Germany originated PCC189, i can only say, that that is the far best signal tube i have in my collection.
GE Sylvania 6922, RCA PCC85(probably made on Mullard tooling) are good ones(just today arrived Philips PCC85 to "compete" with those), also Tungsram PCC85 and 6N1P-EV are also very nice.
All those have nice, but, very different characters. All of my other tubes PCC,ECC,E88CC, i have are not so suitable for 5881.

Considering that only that German PCC189 sounds, lets say, almost like perfect of all those, despite that, that a lot of audiophiles are claiming, that PCC189 can not work as audio signal tube.
Praxis shows opposite.
PCC189 in my case is more then "seaworthy" signal tube in ECC85 audio application. Period.

Further improvements on 5881 are.. Changed all electrolytic caps with RIFA, since i change all mkp s with Jantzen Superior, combo RIFA-Superior brings this amp to an high end level.
Performing even classical music in "full body" is now for my 5881 piece of cake, thanks to RIFAs.
RIFA needs almost a month to burn in.
I use 5881 in very serious DIY setup as one of two amps driving simultaniously DIY speakers with 7 drivers per channel, speakers are omnipole-dipole-BR uniphase principle. my invention.
Both amps are producing somewhere 700W sin per channel and they can be driven full power somewhere 1KW and more, peak per channel.
No distortion, source is top end digital, nothing similar advanced on the market yet, it has no jitter, flutter, there is no moving parts in it..

Thanks to Triode Al i made a vast buying of all kinds of ECC85 for testing in 5881.
Conclusion.
Medium quality ECC85 is better then almost any ECC88.
Not just less hum from tuner bottles, they seems to be built more rigid then signal bottles.
Clear winner over Mullard, Telefunken(i use those also) and other famous, is this bottle, capable of wiping off even famous 6N6P with more gain, clarity, huge musicality(Mullard and Telefunken sounds perfect, but this one sounds perfect and musical to die for) and 6N6P compared to this one has no punch, because of much lesser gain.
It has Rhodium coated pinout, thats very rare, and it looks similar to Bugle Boy, but it is far better performing then other Philips bottles from my stash and it has almost no hum!

1 PC. PCC85 Philips Double Triode 9AQ8 Tube Valve NOS | eBay

Somekind of "holly grail" of signal bottles(it is tuner bottle, but it works great as a signal). I tested it in few different top end tube DACs of my friends, same result, they happily get rid of their s ECC88-6N6Ps for this one.
Tubes in my 5881 are now: KT77 Genalex Gold Lion, pair of Telefunken PCC189 in the middle and Philips PCC85.
Same Philips tubes in tube DAC.

[TRANSDUCEReng]

Originally Posted by CityPooh

Further improvements on 5881 are.. Changed all electrolytic caps with RIFA, since i change all mkp s with Jantzen Superior, combo RIFA-Superior brings this amp to an high end level.
Performing even classical music in "full body" is now for my 5881 piece of cake, thanks to RIFAs.
RIFA needs almost a month to burn in.
I use 5881 in very serious DIY setup as one of two amps driving simultaniously DIY speakers with 7 drivers per channel, speakers are omnipole-dipole-BR uniphase principle. my invention.
Both amps are producing somewhere 700W sin per channel and they can be driven full power somewhere 1KW and more, peak per channel.
No distortion, source is top end digital, nothing similar advanced on the market yet, it has no jitter, flutter, there is no moving parts in it..

Thanks to Triode Al i made a vast buying of all kinds of ECC85 for testing in 5881.
Conclusion.
Medium quality ECC85 is better then almost any ECC88.
Not just less hum from tuner bottles, they seems to be built more rigid then signal bottles.
Clear winner over Mullard, Telefunken(i use those also) and other famous, is this bottle, capable of wiping off even famous 6N6P with more gain, clarity, huge musicality(Mullard and Telefunken sounds perfect, but this one sounds perfect and musical to die for) and 6N6P compared to this one has no punch, because of much lesser gain.
It has Rhodium coated pinout, thats very rare, and it looks similar to Bugle Boy, but it is far better performing then other Philips bottles from my stash and it has almost no hum!

1 PC. PCC85 Philips Double Triode 9AQ8 Tube Valve NOS | eBay

Somekind of "holly grail" of signal bottles(it is tuner bottle, but it works great as a signal). I tested it in few different top end tube DACs of my friends, same result, they happily get rid of their s ECC88-6N6Ps for this one.
Tubes in my 5881 are now: KT77 Genalex Gold Lion, pair of Telefunken PCC189 in the middle and Philips PCC85.
Same Philips tubes in tube DAC.

Hi I have a Yaqin MC-10 running on 6dj8/6922 is it safe to subsitute with pcc85 pcc189..it seems that heater voltage is different.Did you mean the Philips PCC85 was the best replacment for ECC88?Thanks