The Amp Garage

I'm in the process of tweaking a Bluesmaster build, and I'm trying to get rid of some humming (no it's not me :) ) The amp has a built in dumbleator. When I ground the the grid of the recovery stage, the hum disapears. When I ground the other end of the 220k resistor going to that grid, the hum is s...

It is indeed a bass-heavy amp. However, I really enjoy the fatness of the tone when playing the clean channel in jazz mode. Which schematic is the latest by the way? I forget which thread I found it in. I have a question relating to the mid/bass voicing of this amp. It seems the bass and mid pots ar...

Thanks for your answer, it answered my question in part. The reason for the question, is that several threads point out, that the HRM OD channel, should be run with PAB on, so you don't have 2 tonestacks attenuating the signal. However, as my Bluesmaster is now, PAB is not really helpfull in either ...

So, I finally threw out the gyrator and went along with a resistor :-) Next problem: The PAB is muddy. On my #124 build the PAB is much more in the mids. Here, the PAB is darker sounding (muddy) than both mid-boost and rock setting. With PAB engaged, the mid pot does nothing, the bass changes slight...

Uhm, by the way. In fear of asking stupid questions: Why does the resistor need to be rated for 10W?

How many amps are the preamp/PI/screens pulling?


Regards

soje

It is as you found, a simulated choke. Since I didn't have the resistor at hand, but does have the few components to make the gyrator, I went that way. The voltages written are with the gyrator. However, there IS something wrong with the gyrator circuit I set up, so I'm working on that now. When it ...

Thanks for the suggestions. I already did a bit of tube swapping, but tried it again just to be shure, but nothing changed. I did however have the filter cap for the CF sitting right on the tube socket (for testing) and grounded close by. I removed the cap, and it seemed to remove quite a bit of gho...

Hi all. I'm trying to get my latest (2. dumble) build to play ball (I guess making coffee is asking too much). The amp is based on the latest Bluesmaster schematic I could find in the files section. It's build in a gutted Randall RG50TC 50W amp, reusing the tubes, iron, chassis and combo box. The po...

Tony.

I have a Altec Lansing 418B that I would love to try in that cap, if you would share it with me also ?

Thanks!
soje

I'm sorry, I really didn't make myself clear :oops: I'm not interrested in coloring or cleaning up the sound of the d-lator by adding sand. The purpose was simply to free up one half of the triode, for use in a common-anode mixer. My question was primarily related to the possibility of using a commo...

I have a couple of (dumb?) questions, mostly to educate myself :-) How much does the cathode-follower color the sound? Is it normally beeing operated close to clipping? If not, couldn't you substitute it with a mosfet? I read somewhere they should be rather transparrent. The reason for this line of ...

bluesfendermanblues: Thanks for your answer! I'm (somewhat) familiare with Aiken's site. What threw me off, is that there's already the 10M - .22uF - 10M network. Are you simply adding another fb-network, and what does it do soundwise? Another thought: since most pedals and effects have some sort of...

I'm planning a built of the dumbleator, and would like to use the parallel/series version Bluesfendermanblues posted (thanks!)


However there's a bit I don't understand: what's the purpose of the 220k resistor from output the the "0" node?


Regards.

soje

Tonemerc: The tube version (d-lator) is definately in the plans, however I really want to get started playing around with the G-major :-) May I ask which j-fets you used in your klein? I have a 30V adapter from a HP inkjet, so I'll definately get the volts up there. I was trying to sim the cicuit, a...

Thanks for your reply!

yes I have read thru that manual, however I believe that is focused on a kleinulator without the series/parallel switch.

If a J201 has been used for the gain stage, is it reasonable to asume the input sensitivity is around +/- 0.75V?