It should adjust and you can't, or there is no way to adjust as it is now? i.e. the circuit could use/uses a bias trimmer/pot.
Maybe you use them in series? See what happens if you put another 1.5V cell in series to go -4.5V
Yes I use them in series to get -3V, good idea, I will try later, now time to have lunch, today italian food: spaghetti with tomate & meat.
Last edited:
If I were you I would have set the battery between the pot and ground instead (given that the devise feeding it has an output cap). The fewer batterys you serial the higher the tube bias current, which you best measure over 47K.
Last edited:
The stepped attenuator (ladder always the source sess 100K) is in other box, the batteries are in series between the pot & the grid.
Last edited:
35-(8+8)=19mA spare. Alright, almost 20 as we use for minimum. If its cool enough now, give 40.
Hi Salas
Why does K117 used as Vref CCS in the shunt climb faster (less drift) than K170 ?
I know it does but not sure why.
PS:
I have sent you an e-mail....
Why does K117 used as Vref CCS in the shunt climb faster (less drift) than K170 ?
I know it does but not sure why.
PS:
I have sent you an e-mail....
Last edited:
Different Gos (output conductance) parameter probably, although their spec sheets don't mention it specifically .
- Status
- Not open for further replies.