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Okay,,, here goes,, are there any worthwhile upgrades for this unit?
I have some Phillips seven volters coming,,beside that,I am gonna upgrade the lytics in the PS.Anyone with experience with the caps in the linestage? Please feel free to comment/advise.
Thanks in advance.
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At the risk of thread-jacking, I have a Modulus L1 and have wondered about upgrades as well... Though I am nowhere near as handy as the OP seems to be. Is there a vendor who does this work? If in fact there are similar upgrades on the L1's?
Talk to wheezer..Hes the guru on these preamps..
"If it measures good and sounds bad, it is bad; if it measures bad and sounds good, you have measured the wrong thing."
- Daniel R. von Recklinghausen
I am following Mr Wheezer's instructions as precisely as I can,,,I like his approach!!Thank you kindly,,sirs! :)
Are you referring to the 7dj8?
Yep. 7DJ8 .
AI's heater supply will hit around 5.8Vdc with four 6922s(6.3V).
The 7dj8(7.6V heater) in the AI will never reach working emissions. They will sound eerily quiet....and lacking!
I would suggest sending them back unopened!
$ can be better spent on 6H23P Voshkod Rocket logo 70's.
Cheers,
W
OK,,thanks-- I'll go dig out a pair and try em.
Popped the rocket logos in that you suggested,,,very good,,I will get my listen on and report back
Please do.
If you R DIY handy there's a lot of circ. mods & upgrades to be done.
...The HV supply - Schottky them (4)cree csd01060A TO220-2
Cheers,
W
thank you sir-- got em ordered
any other suggestions,,, caps in the linestage?
Calc. your -3db to 1.8Hz or so.
AI = 470K which gets a 1Mgohm AN tantalum and what yur amp's input Z is.
L2 coupling cap, replace with the calc'd value w/Solen PPT at least 300V.
PM me if U need asst.
Cheers,
W
The input impedance is 50,000 ohms
Closest - 2uf 400V SE series.
If U can increase the amp's inp. Z W/O issue, even better?
Ah ha,, got it,, I used the c;aculator on Chris's page,,I am following what you are saying,,,Thank you sir! Now,, once I get the PS upgraded and the Solens in (coupling caps) would there be any benefit in replacing the smaller value caps too?
Again,, thanks for taking the time to guide/suggest!!
upgraded and the Solens in (coupling caps) would there be any benefit in replacing the smaller value caps too?
If you're referring to the small bypass caps on the couplers, they need to be removed. Let the Solens run free.
Enjoy this level of mods for now. :-)
Cheers,
W
Will do
Might as well get the parts from parts connexion and add new grid stoppers:
(4) 560R or 620R Riken 1/2w
Cheers,
W
Ordered,, anything else sir?
Not 4 now.
You'll be very happy from those 2 upgrades and the proper impedance matching.
Well the upgrades are complete,,thank you Mr Wheezer for the help and suggestions. Hopefully I will have some time after the holidays to do some critical listening and report back.
Thanks for the help,,, hot the parts ordered,,,I will report back after I get them installed
That might be a consideration of what I'm told is the original design.
wow-- the seven volters are really pretty good,,,sparkle!
Art Ferris - the 'Man behind the Modulus' spent considerable time listening to the various components that were chosen for the Modulus Pre-Amps -
I assume that by Linestage - you are referring to the the Film Caps labeled 'AI' - those were made to Art's spec - they are Polypropylene film caps - and well made IIRC.
Yes you can go to some other cap d'jour; however I am not sure it will render what you are after-
These units are still realitivly new - so replacing the 'lytics is not strictly necessary-
the PS unit - same as for the M3x is rather robust - if you really want to tweak - replace the bolt holding the power transformer w/ brass or nylon...
Happy tweaking
Thank you sir,,, great idea!
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