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merlin el mago 4th April 2020 01:52 PM

K170BL more hi-fi & uPA68 or K117GR more musicality? No differences between uPA68 & K117GR?

merlin el mago 4th April 2020 02:55 PM

What about SQ of 170GR?

Salas 4th April 2020 08:27 PM

GR or BL same thing when IDSS is enough for this purpose. K117 almost same quality as uPA. But uPA is monolithic well matched pairs by design. He will hear and decide for himself about K170 vs uPA. Difficult to fully explain in words. Its not a practical option for many today because K170 quad is rare, big caution for being faked, expensive, but when available its good to hear in DCG3. Its a more powerful part for transconductance, with more parasitic capacitance also, makes measurable electrical differences.

merlin el mago 5th April 2020 10:22 AM

Finally I will send to Jordi K170, thans for your patient & be safe Salas.

savvas 5th April 2020 06:40 PM

I don't expect whatever changes of Jfet gonna change the sound dramatically
It's more system synergy thing, one might suit better and in this case only a real can tell
I'm gonna try it but first I'd let some hours of burn in and attenuator test first.

With only few hours of play, still it plays beautifully with Muses 72320 in attenuator duties and BIB in power supply. My previous conclusion was that power supply makes much more difference than all the rest, I'd like to see if I'll confirm this with the new one.

Oracle1 6th April 2020 07:48 PM

Salas with F4 amp, needs to alter anything in DCG3 ?

Salas 6th April 2020 08:27 PM

Maybe to set more gain if you will need it depending on your speakers sensitivity and listening habits. Because F4 has none of its own. Higher R6 value increases the gain.

Oracle1 6th April 2020 08:36 PM

1,5k let say?

Oracle1 6th April 2020 08:44 PM

Or to change 5k the R9 of the F4?

Thank you in advance

Oracle1 6th April 2020 09:00 PM

1,5k (4X) !

and we will see

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