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Old 26th August 2010, 02:37 PM   #21
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To make a mu-follower work into lowZ it can be converted to a Kimmel mu-stage.
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Old 27th August 2010, 12:06 AM   #22
Brit01 is offline Brit01  United Kingdom
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Just reverted by to my SRPP and it sounds great.

This time I placed a cascode DN2540 on each top plate for the B+.

Is this worth it? Will it have any audible improvement over a direct connection B+ to the top plates?
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Old 27th August 2010, 12:42 AM   #23
piano3 is offline piano3  United Kingdom
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It should certainly make the load line pretty horizontal and it shouldn't care very much about the PSU
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Old 27th August 2010, 11:20 AM   #24
Brit01 is offline Brit01  United Kingdom
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Was thinking along the same lines. Thanks mate.

Now I'm thinking of my next project.

Using a 6080 or 2.

6080 common cathode with CCS. Nice low impedance (280) for headphones.
Even 2 in parallel could be an option.

or a small triode, 5687 for example followed by a 6080 CF.

I might try the former first. Headphone amps don't need much gain, just low impedance output to match the headphones.
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Old 27th August 2010, 11:15 PM   #25
piano3 is offline piano3  United Kingdom
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You seem very fond of headphones! I used them a lot when I was very young listening after my parents had gone to bed but now I don't even own a decent pair. Nevertheless,the 3 headphone circuits in the Morgan Jones books make a very interesting study and if you have not looked at these then I thoroughly recommend them as a learning vehicle.
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Old 27th August 2010, 11:44 PM   #26
Brit01 is offline Brit01  United Kingdom
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Yep I consider the headphone amps a good learning point. I have an aikido but no valve power amp so not much use with my SS power amp. Even with a low gain tube.
Great as a headphone amp though, but now I'm wiring all point to point and tweaking all the time.

Been through M.Jones notes a little and tried many different circuits and tried current sinks and sources, bypass caps of various kinds etc.

On a long learning curve.

Now I'm trying to collect parts for a power amp. OPTs are the problem here. They don't exist.

Either try an OTL or travel across to Argentina to buy OPTs.

I like the challenge of an OTL. been reading up a lot about them.

Have a set of 6080's I might try 1 channel with.
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