Studio Preamp advice

[thrashcomics]

First off I love this thing. I would like to determine what year it is, there is no indication inside but the serial is 7742.

I have ordered new tubes for it but am not sure if I should also do a recap. This is only the second vintage amp I have owned and the first had had a recap soon before I bought it.

When I turn the bass pot over 1 it drastically affects the overall gain of the preamp. In clean it drops the volume and in lead it drops the gain.

Lastly I am thinking about doing the IIc+ mod found here http://www.rig-talk.com/forum/viewtopic ... 3&t=101252 and was wondering if it would be worth a damn since I am not going through a simulclass poweramp.

 

[MichaelC4]

The build month and year should be inside the preamp.
You will be able to see it when you change the tubes.

 

[thrashcomics]

i know that usually it is, but i can not find it anywhere.

 

[Whoopysnorp]

It doesn't sound right that the gain drops when you turn the bass knob up. The tone might get flubbier as you dial in more bass, but if anything it should add a bit of gain, not take it away.

 

[Shane C]

Lastly I am thinking about doing the IIc+ mod found here http://www.rig-talk.com/forum/viewtopic ... 3&t=101252 and was wondering if it would be worth a damn since I am not going through a simulclass poweramp.

Ive C+ modded my Quad preamp and MKIV and both were tonal improvements in my opinion, the GEQ reacts a little differently. Overall the tone becomes more percussive and bitey.. killer rhythm tone for rock or metal. You don't need to worry about having simul-class, I run my Quad into a VHT-2502 and the C+ mods were just as noticeable as on my MKIV, the power section just adds a little flavour.


Shane