ioaudio
Well-known member
i´ve found the v41 schematic on kubarth´s page. is there any information about the in/out-transformers around?
v41 transformer
- Thread starter ioaudio
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ioaudio
Well-known member
thank you!
one further question: how could one design an output stage capable of driving a 2:1 transformer into 600Ohm with pentodes? is it possible?
one further question: how could one design an output stage capable of driving a 2:1 transformer into 600Ohm with pentodes? is it possible?
NewYorkDave
Well-known member
You said pentodes, but if you'd like to try a dual triode, the output stage of this line-amp drives a 600-ohm load to rather high levels via a 2:1 output transformer.
http://electronicdave.myhosting.net/miscimages/nydave_lineamp1.gif
The output stage (V2) could be adapted for use with other amplifiers as long as you provide the necessary DC bias of about +130V on the grid.
http://electronicdave.myhosting.net/miscimages/nydave_lineamp1.gif
The output stage (V2) could be adapted for use with other amplifiers as long as you provide the necessary DC bias of about +130V on the grid.
ioaudio
Well-known member
thanks for the answers.
kubi: i´m looking for any example circuits regarding pentodes as line level driver, eventually with the ef12 i have laying around.
all the circuits i´ve seen so far used a 7:1 or bigger ratio ot.
nyd: thanks you for your suggestion, i´ve already breadboarded your output stage (the former one with the 12av7) -it works great and when i find a 12bh7 i will try building something with it!
kubi: i´m looking for any example circuits regarding pentodes as line level driver, eventually with the ef12 i have laying around.
all the circuits i´ve seen so far used a 7:1 or bigger ratio ot.
nyd: thanks you for your suggestion, i´ve already breadboarded your output stage (the former one with the 12av7) -it works great and when i find a 12bh7 i will try building something with it!
ioaudio
Well-known member
[quote author="kubi"]
Please take a look at Jakob's Pultec output stage: 2:1 transformer into 600Ohm. The ECC88 can be replaced by some pentodes - possibly wired as triodes. Isn't it what you were looking for?[/quote]
thats about what i´m looking for. the ecc88 could be replaced with lets say two ef12 triode wired?
Please take a look at Jakob's Pultec output stage: 2:1 transformer into 600Ohm. The ECC88 can be replaced by some pentodes - possibly wired as triodes. Isn't it what you were looking for?[/quote]
thats about what i´m looking for. the ecc88 could be replaced with lets say two ef12 triode wired?
NewYorkDave
Well-known member
The corner frequency of C6 and R11 is 2.8Hz.
Decided to raise the topic...
I have some EF12, EF12k and EZ11 and I'm looking for more information about v41. How do you think is it sutable for DIY?
Couple of questions: about B+ voltage and which in/out transformers are suitable?
Thank you!
I have some EF12, EF12k and EZ11 and I'm looking for more information about v41. How do you think is it sutable for DIY?
Couple of questions: about B+ voltage and which in/out transformers are suitable?
Thank you!
