Hi!
I've planned to build a tube preamplifier according to this:
Linear Audio | your tech audio resource
It's a low voltage design witch I think is a good starter project for a beginner like me.
My plan was to use 6922 tubes and GZ34 rectifier. Rp1_ohms = 87 K and Rp2_ohms = 26 K.
For a power transformer I was planning to use this with its 45V tap:
https://www.lundahltransformers.com/wp-content/uploads/datasheets/1683.pdf
and this choke:
https://www.lundahltransformers.com/wp-content/uploads/datasheets/1685.pdf
I did some calculations in PSUD2 and if I use the transformer 45V-tap and rectify it in GZ34, parallell 20uF capacitor, series 17 mH choke, parallell 100uF capacitor, series 17 mH choke, parallell 270uF capacitor --> B+.
What do you guys think? A resonable approach?
I've planned to build a tube preamplifier according to this:
Linear Audio | your tech audio resource
It's a low voltage design witch I think is a good starter project for a beginner like me.
My plan was to use 6922 tubes and GZ34 rectifier. Rp1_ohms = 87 K and Rp2_ohms = 26 K.
For a power transformer I was planning to use this with its 45V tap:
https://www.lundahltransformers.com/wp-content/uploads/datasheets/1683.pdf
and this choke:
https://www.lundahltransformers.com/wp-content/uploads/datasheets/1685.pdf
I did some calculations in PSUD2 and if I use the transformer 45V-tap and rectify it in GZ34, parallell 20uF capacitor, series 17 mH choke, parallell 100uF capacitor, series 17 mH choke, parallell 270uF capacitor --> B+.
What do you guys think? A resonable approach?
If you don't need the gain I would consider a cathode follower for the 2'nd stage as you will have quite a high output impedance as it stands. There's plenty out there. You may stuggle on 45v.
The high output impedance I am aware of. It might be a problem but i plan on building it anyway and se how it performs. If I'm not happy i will tear it appart and build something new, probably with a cathode follower or something completely different.
As for power supply, any suggestions? I do like the chosen transformer as it has 5V, 6V and 48V taps and they are produced locally. As for the rest of the power supply, I am very open to changes.
As for power supply, any suggestions? I do like the chosen transformer as it has 5V, 6V and 48V taps and they are produced locally. As for the rest of the power supply, I am very open to changes.
On internet you can find at low cost a proper trafo to build a good preamp as shown in post 3.
In that case you can use also 6N6 to get a lower gain
Walter
In that case you can use also 6N6 to get a lower gain
Walter
The tube-rectifier is no more. It will be diods instead, the to parallell caps, series choke and then a parallel cap