I had the pleasure of living with a Jeff Rowland Coherence One (Series II) preamplifier for almost 20 years. The Coherence One had a Penny & Giles attenuator and to my ears it was clean, grain-free and lovely. There are many great-sounding attenuators on the market, and P&G is one of them.
is this oil filled and sealed potentiometer a good replace for the not longer available oil filled version from Penny & Giles ?
Potentiometers: Oil Filled Rotary Potentiometer - Series OMCP30
Penny & Giles itself don't offer unfortunately oil filled versions from the RF15 series about
Multi-Channel Rotary Fader | Penny + Giles
To be specific:
The Penny+Giles Rotary fader RF-15 was first used in the Mark Levinson ML-7 (there were some first models with the wirewound Spectrol pot like in the ML-1 though), the ML-6A. 7A and 6B the ML-10 and the No.26 andprobably the 26s.
JRDG uses one stereo for level and two mono´s for Balance in the Coherence One Series I & II.
I´m not sure about Krell in this matter. The KRC I had (the first incarnation) had a Airpax motorized one my Krell KRS-2 had the Spectrol wirewound which I substituted for a RF-15.
In the preamp model Aragon 18K you will find also a RF-15 version - have a look to the attachments: