Nazaroo;
John Broskie for his Aikido created special web-site, so nobody interferes with his speech from tribune. You may consider something similar for your Ju-Jutsu.
John Broskie for his Aikido created special web-site, so nobody interferes with his speech from tribune. You may consider something similar for your Ju-Jutsu.
Is that your theory then?
A comment on a tube justifies a four-page hijack of any thread?
In that case, why stop here.
811s are junk.
300bs are overpriced garbage.
6SN7s are worth about $3 each.
German tube makers stink.
I prefer Japanese tubes to 50 year old JAN stock.
Chinese tubes have that 'magic' tone.
Russian tubes are really the best, because communism has proven itself superior to capitalism in the tube industry.
Lets see if your theory works.
This is actually good practical advice Wavebourn.
I think I will do that, and then comments can be moderated by the thread-starter, as it should be.
I'm confused because some of the schematics show the output taken from the plates of the output tubes, and others show it from the cathodes of the current sources. Which is it?
Only the latter could be correctly classified as a Mu-Follower.
Only the latter could be correctly classified as a Mu-Follower.
I've deleted some personal attacks and posts quoting them.
Amateur here again. (With what will probably be a stupid question?) I thought I understood how the topology worked. I'm referring here to the 6L6/6550 version of the amp. I thought the two output tubes were conducting in class A like an SE amp but were out of phase and then brought into phase by their output being applied to opposite ends of the output transformer primary. So rather than a push pull it was more like a push push.
Also, is there any reason this topology couldn't be wired ultralinear? I have a 25 watt Hammond output transformer, four 6L6's and Four 6550's. so I have some of the components already. And Nazaroo I think you said you were using a Jensen output transformer on the input, is that right? And if so which one?
As for EL34's I think they are lovely sounding tubes. I built an 8b copy using JJ el34's which I really love. The mid range is especially nice. And SY said it when he mentioned the model 9 Marantz. If I ever get the money I want to build a pair of 9's using Plitron OPT's.
Also, is there any reason this topology couldn't be wired ultralinear? I have a 25 watt Hammond output transformer, four 6L6's and Four 6550's. so I have some of the components already. And Nazaroo I think you said you were using a Jensen output transformer on the input, is that right? And if so which one?
As for EL34's I think they are lovely sounding tubes. I built an 8b copy using JJ el34's which I really love. The mid range is especially nice. And SY said it when he mentioned the model 9 Marantz. If I ever get the money I want to build a pair of 9's using Plitron OPT's.
Basically what you have is a parafeed. And that can be driven by mu followers, SRPP, CCS-loaded triodes, Schade-feedback pentodes, Ultralinear, cathode followers... basically any kind of topology. Parafeeds have been done push-pull or single-ended. Both are illustrated earlier in the thread.
Nazaroo,
This is just my opinion,
I think that what is missing here is a build type section in this thread.
I know that there are probably many here that would like to build your amp and listen to it.
However as most people including myself do have limited time to spend trying new "unproven" <<to me ideas. To quantify this statement, I have not been able to listen to it!
I will give an example, Lets say I want to build this amp in a modest way<<ie medium power (Invest some money on what should be a great experience). There is no single post in this thread with a complete schematic with component values. So the assumption is the builder is going to "design" the circuit hoping that they have the correct parameters to achieve this level of sound. If they make a bad job of this your theory is going to be dashed on the rocks...If you provide a build post in this thread you will get far more support.
Surly the whole point of this thread is to get positive feedback from other peoples builds..I could be wrong! 🙂 and you may just be presenting the idea..
Regards
M. Gregg
This is just my opinion,
I think that what is missing here is a build type section in this thread.
I know that there are probably many here that would like to build your amp and listen to it.
However as most people including myself do have limited time to spend trying new "unproven" <<to me ideas. To quantify this statement, I have not been able to listen to it!
I will give an example, Lets say I want to build this amp in a modest way<<ie medium power (Invest some money on what should be a great experience). There is no single post in this thread with a complete schematic with component values. So the assumption is the builder is going to "design" the circuit hoping that they have the correct parameters to achieve this level of sound. If they make a bad job of this your theory is going to be dashed on the rocks...If you provide a build post in this thread you will get far more support.
Surly the whole point of this thread is to get positive feedback from other peoples builds..I could be wrong! 🙂 and you may just be presenting the idea..
Regards
M. Gregg
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When you have been here a few years, rather than a few months, you will realise that interesting diversions of threads are common. The mods are fairly flexible here - I know other sites where they quickly clamp on diversions. You will also realise that the OP does not own the thread. Furthermore, you will also discover that a polite request to return to the main topic is likely to have more effect than a moan or an insult.nazaroo said:
As others have pointed out, you introduced the EL34 diversion by making comments which were historically wildly inaccurate.
Or just a schematic, even... So that people can simulate it.
It does not have to be a super-powerful one, maybe EL84's ?
Just by coincidence I made up a quick PCB design for PP EL84s and sold state CCS with a 6N1P as a driver. Unfortunately, it's a bit big at about 12" x 3". I might try to break it down into three smaller PCBs that make it cheaper and more flexible. One issue is that for a good load of about 50ma and B+ of 330v, the tubes are loafing along at 11 watts. Maximum power output will be about that same 11 watts, not big, but not bad either. If there's enough interest, I might get a batch of PCBs run. I have no doubt that the design does work (I've built a similar single ended version), but whether or not it offers any significant advantages I leave up to people with better ears than mine.
A complete schematic would be nice, as I asked in an early post. (Although I should have asked more nicely!) But why a low power one? Its a low power amp to begin with.
Nazaroo, is output impedance that same as for a push pull using the same two tubes?
Nazaroo, is output impedance that same as for a push pull using the same two tubes?
A mu follower will generally have a lower output impedance at the cost of extra tubes, efficiency, and voltage. That output impedance is a function of the load you want it to drive, and at lower loads, the distortion and output impedance rise- if you have a copy of "Valve Amplifiers," the mu follower is analyzed on pp115-120. You might do a bit of searching online to see if Chris Paul posted his excellent analysis of the circuit as well.
Interesting....I think it was impatience linked to lack of a working circuit diagram that was the issue.. and not your fault >> caused by genuine interest.
So in the pursuit of audio excellence if Nazaroo has a working amp it should be easy to just draw and post even a hand drawn diagram. I suppose it depends on how he feels..LOL
Regards
M. Gregg
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As a lurker here I would also love to see Nazaroo put together a kit or a set of plans with specified components for the DIY and sell them for what he deems appropriate. I am interested but lack the know how to turn his schematics into a functional amp for myself. He has obviously put a tremendous amount of thought and passion into his design so I think there are plenty of interested people willing to give it a go.
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