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166.137.101.144
I recently purchased an Audible Illusions Modulus 3A preamp and like it a lot, just curious what type of passive mods fellow owners use , type of power cord, fuses, tube dampers, cryogenic treated tubes, etc.
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then they may need replacement (search Audible service). Look inside and find the date on the wire board. if it's 2000 that's a good thing. I forget what to do if the transformer is humming.
M
I have had 4 AI preamps. Beware of upscale for tubes. I have always gotten better tubes from TubeWorld. I prefer Amperex and Siemens NOS tubes in Audible Illusions Preamps. I probably have 15 to 20 various sets of 6922 (and variant) tubes. Nothing is "cleaner" than expensive NOS Telefunkens. They just don't have the "liquidity" or the harmonics that the Siemens and Amperex display. For tube "lushness" on vocals - expensive NOS Mullards. No matter what the hype is the various sellers state such as "This is the S___ for NOS Telefunken;" if they are asking $250.00 and the great Telefunkens usually go for much more - well - beware.
I added Ferrite Beads on the Phono leads (Between the rear of the jacks and the PCB) to reject RFI - works like a charm!
6H23EB tubes from Upscale
"Man is the only animal that blushes - or needs to" Mark Twain
Read what he says in bold type -- "troublesome preamps"
for years - I've also used Tungsrams and Matshushitas with no failures
"Man is the only animal that blushes - or needs to" Mark Twain
Keep in mind that the EH 6922 is the current production 6H23-EB tube. The EH is an excellent choice for the AI, which is hard on tubes.
in my stash so I tried them in the line stage last nite. I just might like them better than the 6H23s
"Man is the only animal that blushes - or needs to" Mark Twain
but I'm into my 19th year (3 then 3a) and have not experienced that. At least none have failed..........Thanks, Jim, for the tip on the EH-6922 though
"Man is the only animal that blushes - or needs to" Mark Twain
Very hard on tubes, the average user/owner get about 1-2 years out of them before a replacement set is needed.
Cheers george
I have the newer AI 3B, and my tubes are doing just fine as they did with the 3. You have to take the advice of the designer and NOT use tubes that AI does NOT recommend for use. When you use NOS or others, it's no wonder that they don't last.
Sold NOS mullards to an M 3 owner. Crapped out in one week. Replaced them and same thing. Four days and they failed
refunded money but took a big financial hit as well.as.loosing valuable tubes no longer made.
I must be one lucky fucker (see above)
"Man is the only animal that blushes - or needs to" Mark Twain
AI pushed a lot of current through the tubes. There is a guy who modifies the units ( more to CJ's specs) which lowers the tube strain. On a CJ, tube life with paralleled 6922's is extremely long many years: mine was well in excess of 7 years and still tested very strong.
AI runs the tubes at 4mA per side and the plates in parallel.... very low for a 6922.
Vp is 125.
Never measured the AI thanks for the Info. CJ also runs the plates in parallel and B+ is about 76 V
So they're running the current way up?
Opposite of AI.
The reason why they sound the way they do is because AI pushed (biased) the tube to it's max and maybe a bit more, reduce it to the way others use it and it will sound every one elses preamp the uses this configuration.
Cheers George
Wheezer(??) - see below.
"Man is the only animal that blushes - or needs to" Mark Twain
With your DMM on Vdc, black lead to the back ground nut.
Red to the big coupling cap's lead facing the front of the chassis (V3,V4.
What's the reading at both caps?
with the selector at DCV x 1000 the needle moves three notches on the lower black scale. It also does not drop to zero and I don't know how to reset needle to zero
"Man is the only animal that blushes - or needs to" Mark Twain
Are you saying it read 300V?
I guess so
"Man is the only animal that blushes - or needs to" Mark Twain
your tubes are circling the drain.
Hook up the meter and send me a pic.
-
"Man is the only animal that blushes - or needs to" Mark Twain
Edits: 08/29/14
wouldn't that be 3,000?? Forgive my ignorance please
"Man is the only animal that blushes - or needs to" Mark Twain
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