Graham Slee Elevator EXP Pre Preamplifier (2xAD829+OP249) Schematic ?

[tiefbassuebertr]

Who can upload a schematic of this pre-pre ?
A slight popping is audible without playing a record - dependent of the position of power supply lead (connection cable) to the pre-pre.
Thank you very much.

Graham Slee Projects Era Gold Phono Stage and Elevator EXP Step-Up [English]
Graham Slee Elevator EXP Pre Amplifier - Analogue Seduction
era gold mkv graham slee + elevator mk III mc - DISQUANTIQUE
MachOne classics - einfach Stereo! | Graham Slee ELEVATOR EXP

 

[duncan2]

Sounds like slight instability or RF pick up --not surprising when a bandwidth of more than 50MHz is spec for those two video chips .


A "cure " using small value ceramic capacitors might help as you would in a repair to a HF communications receiver.


Matter of fact bandwidth can be increased to 95MHz (-3db) .



At those frequencies even very small faults are amplified.

 

[tiefbassuebertr]

This is also from my view the reason.
But unfortunately without schematic I haven't a possibility to help a friend (which isn't able to create the circuit diagram with help of the PCB's) and send him the appropriate instructions.

 

[duncan2]

I cant find any schematics of his products but you could try his forum -


Graham Slee Audio Forum | HiFi System Components


or contact him.