Those Tangos seem to be really expensive, but it seems there is a need to lower the impedance.
What are you driving with this unit?
Looking at the ratio (33:1), how "light" of a similar transformer ratio will produce mariginally acceptable sound, if driving another complete amp with its own pe-amp stage or two?
I'm looking at small, old, output trafos on the order of less than a pound or two with a similar ratio. To breadboard a 6SN7 as you mention, just to experiment, would they sound ok (as interstage subs)?
What are you driving with this unit?
Looking at the ratio (33:1), how "light" of a similar transformer ratio will produce mariginally acceptable sound, if driving another complete amp with its own pe-amp stage or two?
I'm looking at small, old, output trafos on the order of less than a pound or two with a similar ratio. To breadboard a 6SN7 as you mention, just to experiment, would they sound ok (as interstage subs)?
I would be rather concerned about using four 6SN7 sections in series (2 in the linestage, 2 in the Sun driver stage) to drive a 300B or 2A3. There is a real danger that the 6SN7 sonic fingerprint is going to overwhelm everything.
Personally, I would be looking towards constructing a single stage pre using an alternative tube. If you are adventurous, a 2C51/396A or 407A/407B (much cheaper) should work very well with your transformer. I have been very impressed messing round with these tubes in a 15k:600 parafeed arrangement.
pm
OK, another maybe stupid question.
What about using the 6SN7 as a combination voltage amp and cathode follower, then another done up the same way as a second stage, and skipping the interstage trafo altogether, just using a DC blocker cap for output, and possibly a tone stack between the two, or at the end?
Similar to what many guitar amps did with 12AX7's, only an octal version of the same idea?
What about using the 6SN7 as a combination voltage amp and cathode follower, then another done up the same way as a second stage, and skipping the interstage trafo altogether, just using a DC blocker cap for output, and possibly a tone stack between the two, or at the end?
Similar to what many guitar amps did with 12AX7's, only an octal version of the same idea?
ocha said:
Hello ocha
You're welcome. I live in HCMC and do not use YM. You can email via hvdinh@hcm.vnn.vn.
Can you share your pre schematics and what is the progress so far?
Hello
I've just got a few questions relating to the attached schematics. Can anyone tell me the difference between using 0.22uf/630V capacitors and 0.47uf/630V ones in the position of 1uf/630V, and can I use 100uf/16V in the position of 470uf/25V, which one is better?
Thanks a lot.
Andersen
I've just got a few questions relating to the attached schematics. Can anyone tell me the difference between using 0.22uf/630V capacitors and 0.47uf/630V ones in the position of 1uf/630V, and can I use 100uf/16V in the position of 470uf/25V, which one is better?
Thanks a lot.
Andersen
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An externally hosted image should be here but it was not working when we last tested it.
Hi Andersen,
this circuit is a SRPP design. You can find general information about this kind of circuit here and even more infos in this article from the same author.
To answer your question for the 100uf it should not modify too much the behavior but i'm not sure about V rating, 16V should be ok but 25V is specified on schematic so better to stand with it.
For the 1uf it's a different problem as SRPP is designed with a defined load Z at target and changing this cap with a different load Z than the one specified for this circuit can alter the BW. EG: 0,47uf with 10k load is about 34hz.
Beware your heater must be 'elevated' at some 60v or so (depend on your B+) for the circuit to behave correctly (see anode to heater limit in tube datasheet).
this circuit is a SRPP design. You can find general information about this kind of circuit here and even more infos in this article from the same author.
To answer your question for the 100uf it should not modify too much the behavior but i'm not sure about V rating, 16V should be ok but 25V is specified on schematic so better to stand with it.
For the 1uf it's a different problem as SRPP is designed with a defined load Z at target and changing this cap with a different load Z than the one specified for this circuit can alter the BW. EG: 0,47uf with 10k load is about 34hz.
Beware your heater must be 'elevated' at some 60v or so (depend on your B+) for the circuit to behave correctly (see anode to heater limit in tube datasheet).
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