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Tubes for Modulus 3A

I took delivery of a used Modulus 3a today. I have a Modulus 3 which will go to my second system upstairs. I am not happy with the sound of this preamp, it sounds a bit thin, not much bass. I replaced the tubes with new Sovtek 6922's, but I am still not there yet.

I don't want NOS tubes and want to keep the price low and I also don't want tubes that will die in a few months. Recommendations please? I want more bass!!!
128x128stereo5
tsciame
88 posts
 
I use cryo'ed 6H23-EB's with Herbie Tube Dampers in my AI Mod3b. I also use 3 cones (points down) for isolation.

Tony
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stereo5 OP
6,471 posts
 
what is the difference between the 3a and 3b? There is no mention of the 3b on AI website.
tsciame
88 posts
 
The differnce between a 3a and 3b is about 12 months of wait time. All joking aside Art made severial refinements (I would need to review the manual) but I was never able to pin him down. That being said it's a great unit.

Sorry I can't be of more help.
Tony
stereo5's avatar
stereo5 OP
6,471 posts
 
Art Ferris called me this evening regarding a post I made about my secondary preamp the Modulus 3 (origional) I have a problem with one channel in the phono section and we had a great chat. He said their web site will be updated before the end of the year and that he is making the 3b now and it has much more refinements than the 3a. He did tell me to be careful regarding the EH6322 tubes as the newer ones are junk, perform poorly and microphonic as hell.

He really made my day!

Bob
tsciame
88 posts
 
You should get your tubes from him... more often than not it is better IMO to go to the manufacturer.

Tony
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