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Old 9th April 2008, 12:22 AM   #911
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Quote:
Originally posted by BWRX


Sounds similar to adding high frequency AC bias to a signal to reduce distortion on an analog tape.
OK, go for it!

Joe R.
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Old 27th July 2008, 08:45 PM   #912
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As i have slowly aquired all the parts and the idea for the case comes more clear I thought about grounding the jlti.
I will use 3 Transformers, one for the Chips (2x regulated PSU), one for the Tubes (maybe 1x or 2x regulated) and one for the Heating and the rest of the stuff. I drew a picture of how I would do the grounding. Maybe somebody can take a look and give me a go.

Thanks in advance, Shanavar
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Old 27th July 2008, 09:01 PM   #913
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My neck is a bit sore and my eyes not so good at this time of night so I will just offer how I did it .
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Old 7th February 2009, 05:18 AM   #914
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newbie question,

i would like to build this, but do not have 6922 at hand

can the 6922 be replace by 12ax7 or 12au7 or 12b4? guess not ? as i have these 3 tube in the closet.

thx in adv
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Old 7th February 2009, 05:23 AM   #915
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Quote:
Originally posted by milen007
can the 6922 be replace by 12ax7 or 12au7 or 12b4?
12au7's your best bet. lower mu and lower Gm, but neither of those probably matter that much here.
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Old 7th February 2009, 05:39 AM   #916
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nice. you recon should not be a problem? i ll be ordering parts then...

from my understanding the tube buffer is 1 tube for two channel right? as i saw in nuuk's site, he used 1 per channel.

thx for the input
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Old 7th February 2009, 06:26 AM   #917
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Quote:
Originally posted by milen007
newbie question,

i would like to build this, but do not have 6922 at hand

can the 6922 be replace by 12ax7 or 12au7 or 12b4? guess not ? as i have these 3 tube in the closet.

thx in adv
You could, but the positive supply needs to be a lot higher, in which case you might as well make the negative the same and adjust cathode resistor to negative to give 3-4mA.

Mind you, the original reason for choosing 6922/6DJ8 was to encourage those who had previously felt reluctant making tube DIY (high voltages can be scary) and to do their first tube DIY project with voltages no higher than SS. There will never be an easier introduction to tube DIY. I think it has been quite successful in that regard. Many would never have tackled tubes otherwise and also it gives many the confidence to embrace it further.

Joe R.
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Old 7th February 2009, 05:12 PM   #918
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hi Joe R

thanks for the input. whats your recommended supply for the 12au7 or 12ax7 or maybe 12b4? i did tube preamp before. hence high voltage is acceptable. thx in adv

regards,
Erwin
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Old 7th February 2009, 10:18 PM   #919
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Quote:
Originally posted by milen007
hi Joe R

thanks for the input. whats your recommended supply for the 12au7 or 12ax7 or maybe 12b4? i did tube preamp before. hence high voltage is acceptable. thx in adv

regards,
Erwin
I would choose 12AU7 and get a minimum 80V and preferably 100V and even more won't hurt - and 5mA and even up to 10mA. You could use one half of the U7 as the follower and the other half as a current source to neg supply, in which case the neg supply should be the same as the positive.

Joe R.
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Old 22nd September 2009, 03:16 AM   #920
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Hi,
I am in the process of acquiring the parts for building this amp. Has anybody used a CLC designed power supply for the tube power? I happen to have a 22H choke in the closet just waiting for a project. The DCR of this choke is about 260, close to the resistor used in the CRC filter. Thoughts, ideas, suggestions?
Jeff
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