I mean, if we care about if a toob or toob sample has 1,7 or 2,4 pF Cga and it differs 2 pF on how the wiring is made...
And there seems like theres no biggie difference between the OTK class samples then the other EV's. Maybe a little tighter intertriode-matching on transconductance but I have actually found tighter matches on the non-OTK already.
The internal figure is going to multiply with gain, the external parasitic will just add
What happens with grid current with a 47k load resistor and an MM PUP-coil. I guess the dc-resistance is far lower in the coils and the current will flow there and overflux it totally?
Right channel 0.582VDC
Left channel 0.577VDC
Have I to add other diode 1N4148 in series?
You could start with that and see how it behaves. Later on, if this is the problem, you should try some IR-leds and see at what bias grid current starts in yous circuit and with your tubes.
Voltage across the 2 diodes
Right channel 1.145VDC
Left channel 1.130VDC
Voltage grid to gnd
Right channel -0.000VDC
Left channel -0.000VDC
Right channel 1.145VDC
Left channel 1.130VDC
Voltage grid to gnd
Right channel -0.000VDC
Left channel -0.000VDC
Sounds better but still needs more gain, with step-up Jensen + Denon DL103R (R.I.P.) volume setting was half volume, now to start to listen music I have to set to half the volume attenuator & near full volume to have the same gain than Jensen+Denon DL103R (R.I.P.) of course full volume I have noise so not pleasant, with step-up listening setting was half volumen.
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Can you confirm the gain is over 40dB with scoping 20mV peak to peak 1kHz sinewave from generator on the phono input, then scoping the phono output and calculate?
Also is the Linn K9 new or old? In good working order? Is the vertical tracking weight correct?
Is old but in very good condition not very used, yes I used scale digital precision.
N.B. I think Linn not make anymore the K9
N.B. I think Linn not make anymore the K9
When working well and having 4.5mV output given the phono is alright as before and will measure 40dB gain or more without SUT there is no reason to have low volume other than some wiring mistake. Check the wire pins colors on the back of the cartridge also.