Hello everybody,
I am about to build a Valve Itch since a while. Now I got all the parts together and I started building the power supplies.
As I understood the shield between the triods of the 6N2PEV (Pin 9) goes to ground. Is this also true for the elevated valve or does it go to the 150V point for the elevated heater instead? I did not find a reference in the thread so far.
Best
J.
I am about to build a Valve Itch since a while. Now I got all the parts together and I started building the power supplies.
As I understood the shield between the triods of the 6N2PEV (Pin 9) goes to ground. Is this also true for the elevated valve or does it go to the 150V point for the elevated heater instead? I did not find a reference in the thread so far.
Best
J.
Have anyone noticed if the 6N2PEV produces grid current below 1,2 V biasing? The datasheet suggests that it might do http://www.goldenmiddle.com/files/6N2PEV.pdf. An IR LED like https://www1.elfa.se/data1/wwwroot/assets/datasheets/ir908-7c_eng_tds.pdf or a 1N4148 might be around 0,7 to 1 V.
Salas I want to try a MM cart Linn K-9 specs:
Manual
Weight 7.1gr
Tracking force 1.5-2gr
Recommended load 47K
Output at 5cm/s at 1 kHz 4.5mV
Others see on the web
Compliance 12cu
Capacitance loading 200pF including arm cable
coil inductance 400mH
pick-up the same Audio Technica AT95E
The question is I have 100K trimmer to adjust the load resistance but I forgot how to do, could you help me please?
TIA
Felipe
Manual
Weight 7.1gr
Tracking force 1.5-2gr
Recommended load 47K
Output at 5cm/s at 1 kHz 4.5mV
Others see on the web
Compliance 12cu
Capacitance loading 200pF including arm cable
coil inductance 400mH
pick-up the same Audio Technica AT95E
The question is I have 100K trimmer to adjust the load resistance but I forgot how to do, could you help me please?
TIA
Felipe
Last edited:
Read this article, it has all you need to know:
Load the Magnets!!! - [English]
Load the Magnets!!! - [English]
Felipe. Go ahead and try. Your ears are the ultimate truth, they cant go wrong. If you hear anomalies it is probably MM sensitivity to capacistance loading, IE grid capacistance to input. If so try shortening cables or us low capacistance ones. You will go abit loudness but that is easily corrected with a HQ bridge.
This USSR input tube at this gain should give about 60pF Miller, add this to your cables pF expectation. If not having FFT capability, use ears while tweaking the input resistive load.
TT cables 180pF + 60pF Miller = 240pF so 40pF more than manufacturer recommend including tonearm capacitance. Have I to not add capacitance right?
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