Hi,
Aren't these the ones that were used in some Luxman gear and the original Anzai SRPP preamp?
Ciao, 😉
Aren't these the ones that were used in some Luxman gear and the original Anzai SRPP preamp?
Ciao, 😉
the Luxman LV103/105 used the 6FQ7/6CG7 in a differential LTP mode feeding a pnp buffer.
i have one under restoration and am planning to use the 6RRH8 or the 6RRH2...
i have one under restoration and am planning to use the 6RRH8 or the 6RRH2...
Thanks Ian for posting that information, quite surprised to see how mediocre the 6N1P linearity is in SRPP compared to any of the others.
I went through a phase of quite liking the SRPP, I seem to be over that now.. (It's been more than a decade since I designed anything that uses it.)
In terms of the AI pre-amp I seem to recollect that the usual cure for the tube life problem around here was to lower the pre-amp's plate supply voltage about 20%, but I no longer remember any of the details unfortunately.
I went through a phase of quite liking the SRPP, I seem to be over that now.. (It's been more than a decade since I designed anything that uses it.)
In terms of the AI pre-amp I seem to recollect that the usual cure for the tube life problem around here was to lower the pre-amp's plate supply voltage about 20%, but I no longer remember any of the details unfortunately.
Hi,
That's a relatively recent era. I was thinking more about the time Tim De Paravicini used to design the Luxman stuff.
One of my all time favourite CDPs is the Lux 107 BTW. it may be flawed in umpteen ways but it is utterly musical. I hold a similar view of the old Linn Sondek LP12 TT. 😀
It's a useful topology which is by and large both often misunderstood and needlessly overused.
Not that I need to tell you that anyway....😀
I used SRPP tech in a lot of my designs back in the late 1980's as an improved WCF.
A circuit that was very briefly shown in one of Jean Hiraga's books.
When you need gain and do not want to resort to sand the mu-follower and cascode are still among my fav topologies.
Horses for course as usual...
Les chefs et leurs recettes, n'est-ce pas?
Ciao, 😉
That's a relatively recent era. I was thinking more about the time Tim De Paravicini used to design the Luxman stuff.
One of my all time favourite CDPs is the Lux 107 BTW. it may be flawed in umpteen ways but it is utterly musical. I hold a similar view of the old Linn Sondek LP12 TT. 😀
It's a useful topology which is by and large both often misunderstood and needlessly overused.
Not that I need to tell you that anyway....😀
I used SRPP tech in a lot of my designs back in the late 1980's as an improved WCF.
A circuit that was very briefly shown in one of Jean Hiraga's books.
When you need gain and do not want to resort to sand the mu-follower and cascode are still among my fav topologies.
Horses for course as usual...
Les chefs et leurs recettes, n'est-ce pas?
Ciao, 😉
i find the Broskie CCDA topology in a line amp very pleasing to my ears, and from what i read about srpp, i am not inclined to try it anytime soon.....😀
i also built some of Broskie's aikido, and based on feed-backs from those who tried, there is not a day and night difference between it and the CCDA...additionally, the ccda cost less to make....
i also built some of Broskie's aikido, and based on feed-backs from those who tried, there is not a day and night difference between it and the CCDA...additionally, the ccda cost less to make....
I think I used it well, but found other solutions ultimately that were even more entertaining..DHTs and high transconductance triodes/pentodes served up in a variety of ways. It's all in the ingredients.. Le nouvelle cuisine.. 😉
Strangely enough at the time I found the 6SN7 quite pleasing in SRPP. (Still do actually)
Strangely enough at the time I found the 6SN7 quite pleasing in SRPP. (Still do actually)
Hi,
But you should. So you know instead of reading about it?
Trust me, it has it uses.
CCDA is nothing new, we used to call it forced class A operation.
Il n'y a pas le moindre doute, chef.
Cheers, 😉
But you should. So you know instead of reading about it?
Trust me, it has it uses.
CCDA is nothing new, we used to call it forced class A operation.
Il n'y a pas le moindre doute, chef.
Cheers, 😉
I am torn between the mu follower and the SRPP. The mu follower has excellent distortion but poor drive capability. I used it a lot in my early tube mixer designs but when I needed to build more complex ones, the mu followers lack of drive became a problem. The SRPP has higher distortion but excellent drive capability. The solution I found was to use the SRPP preceded by half a 12AX7 with about 20dB of negative feedback. The result is here:
http://www.ianbell.ukfsn.org/EzTubeMixer/docs/EzTubeMixer/EurocardCCTsht2.jpeg
Its distortion level and spectra are very similar to the mu follower with much improved drive capability.
The 6N1P is certainly a bit of an anomaly. I am not sure if it really is the equivalent of anything from the west. It certainly produces quite high distortion which perhaps explains its popularity in guitar DI boxes.
Cheers
Ian
6922EH type 2 , 3 how do you tell them apart
Hello all, my first post.
How do you tell a 6922 EH type 2 from a type 3 Tube ? I do not have the boxes. They are the new tubes from Russia. Mine have a ring getter supported on two sides by rather thick posts. Under made in Russia is 13 04. The date stamp I assume ?
And what are the tone differences of the two types ?
Thanks for any help.
Hello all, my first post.
How do you tell a 6922 EH type 2 from a type 3 Tube ? I do not have the boxes. They are the new tubes from Russia. Mine have a ring getter supported on two sides by rather thick posts. Under made in Russia is 13 04. The date stamp I assume ?
And what are the tone differences of the two types ?
Thanks for any help.
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