I want to make a linestage with 6N16B, I have found this schematic, could help me to see if have any issue or a way to upgrade it. More information in this link http://freestompboxes.org/viewtopic.php?f=2&t=9923, but I can see clearly the B+ & filament heater requirements.
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try like this
Rout in range of 4K4
presumed load around 100K
use Ub in range of 120-130V
expect around 95V at anode
pre-set CCS to 5mA (I'm lazy to read datasheet toi determine exact resistor )
float heater supply and lift it to 30-40V
best to heat with LM317 based CCS , preset to 400mA , when tube is hot , set exactly to 6V3
Rout in range of 4K4
presumed load around 100K
use Ub in range of 120-130V
expect around 95V at anode
pre-set CCS to 5mA (I'm lazy to read datasheet toi determine exact resistor )
float heater supply and lift it to 30-40V
best to heat with LM317 based CCS , preset to 400mA , when tube is hot , set exactly to 6V3
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What are your requirements ?
- gain
- output impedance; low (cathode follower output) or higher (anode output)
- inverting or non-inverting construction
- low distortion or "tube sound" design
Here is one with high performance, i.e. low distortion, flat frequency response and low output impedance. Technical specification is in the schematic.
Kuva 26819 - Kuva.termiitti.com
An externally hosted image should be here but it was not working when we last tested it.
Kuva 26819 - Kuva.termiitti.com
And you gave a good example. Add there Zen Mod's proposal, and it will be even better.
Yes, something like that. But I personally prefer a single FET with resistive degradation, connected like gyrator. However, any active load may contribute more noise than single resistor, but resulting distortions will be lower.
Then the whole design must be changed since the size of anode resistor (together with resistors at the cathode) determines the gain, and I wanted to set it to some 10 dB. Line stage usually needs small gain.
In general I think that two FETs at the anode of medium or low mu triode is waisting of resources. Just one is sufficient. It usually represents some 500k to over 1M resistance. There is not much difference if this impedance is multiplied by 10 (even though some guys can clearly hear the difference).
In general I think that two FETs at the anode of medium or low mu triode is waisting of resources. Just one is sufficient. It usually represents some 500k to over 1M resistance. There is not much difference if this impedance is multiplied by 10 (even though some guys can clearly hear the difference).
requirements:
-high gain
-low output impedance
-high input impedance
-non-inverting
-low distortion
-flat frecuency response
The only concrete requirement is "Non-inverting", the rest is undefined. You have to put numbers for each criterion.
-high gain -- how much?
-low output impedance --lower than...?
-high input impedance --higher than...?
-non-inverting
-low distortion --what kind of distortions..., which level...?
-flat frecuency response --how many DB in which band?
-high gain -- how much?
-low output impedance --lower than...?
-high input impedance --higher than...?
-non-inverting
-low distortion --what kind of distortions..., which level...?
-flat frecuency response --how many DB in which band?
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thanks for schematic:
input/output impedance?
gain?
if I don't use DN2450, how much current & voltage have to set my regulator?
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