Frondelli vs Lar/Mar PPIMV
Posted: Tue Mar 24, 2020 6:19 pm
Hi all,
I incorporated the Lar/Mar into each of my three amp builds (JTM 45, '68 spec Superbass and a '63 Brownface Vibroverb replica) and so far I'm quite happy though I'd love to avoid the affects on the NFB at lower PPIMV settings.
I would love to hear an account of how the two compare from anyone who tried the Frondelli.
Frondelli PPIMV on Rob Robinette's site:
https://robrobinette.com/Generic_Tube_A ... ter_Volume
Seems to basically differ from the Lar/Mar by having the wires from the PI caps connect to the wiper terminals and the other pair of wires running from the left terminals to pin 5 of the power tubes instead of going from the wiper to pin 1 (actually - to the 5k6 swamp resistors on pin 5 in my Marshalls).
It also doesn't need the failsafe resistors.
I incorporated the Lar/Mar into each of my three amp builds (JTM 45, '68 spec Superbass and a '63 Brownface Vibroverb replica) and so far I'm quite happy though I'd love to avoid the affects on the NFB at lower PPIMV settings.
I would love to hear an account of how the two compare from anyone who tried the Frondelli.
Frondelli PPIMV on Rob Robinette's site:
https://robrobinette.com/Generic_Tube_A ... ter_Volume
Seems to basically differ from the Lar/Mar by having the wires from the PI caps connect to the wiper terminals and the other pair of wires running from the left terminals to pin 5 of the power tubes instead of going from the wiper to pin 1 (actually - to the 5k6 swamp resistors on pin 5 in my Marshalls).
It also doesn't need the failsafe resistors.