ADA Power Amps > Microtube 200 MT-200
MT-200 FAQs
Dante:
Yo! I'm about to start using my rack on a regular basis again :banana: and that means I'll be running through my MT-200; Microtube power amp. So, for those of us who have one, or those who are just interested in finding one, here are the answers to common questions about them.
Q: Can I run one side at a time?
A: Yes. The two sides are independent of each other
Q: If I run only one side, how many watts is it?
A: The manual says 100w at 4 ohms per side, somebody smarter than me can tell me what the rating is into 8 ohms or 16.
Q: Is it stereo??
A: Yes. Because the two channels are independent (as mentioned above)
Q: What kind of tubes should I run?
A: Oh boy. Whatever you like. It's a very subjective topic of much deliberation. I went with very clean, low noise 12ax7 tubes...not sure what brand. I didn't like tubes intended for high gain preamps. (just my taste, ymmv)
I have more...I'll update this post later, gotta run
Iperfungus:
What are you going to do??? >:D >:D >:D
Harley Hexxe:
--- Quote from: Dante on March 12, 2021, 07:36:25 AM ---Yo! I'm about to start using my rack on a regular basis again :banana: and that means I'll be running through my MT-200; Microtube power amp. So, for those of us who have one, or those who are just interested in finding one, here are the answers to common questions about them.
Q: Can I run one side at a time?
A: Yes. The two sides are independent of each other
Q: If I run only one side, how many watts is it?
A: The manual says 100w at 4 ohms per side, somebody smarter than me can tell me what the rating is into 8 ohms or 16.
Q: Is it stereo??
A: Yes. Because the two channels are independent (as mentioned above)
Q: What kind of tubes should I run?
A: Oh boy. Whatever you like. It's a very subjective topic of much deliberation. I went with very clean, low noise 12ax7 tubes...not sure what brand. I didn't like tubes intended for high gain preamps. (just my taste, ymmv)
I have more...I'll update this post later, gotta run
--- End quote ---
As an experiment I did one time with my MT-200, I used a pair of Fender branded high gain 12AX7's in it, and that seemed to produce a more prominent effect on the Presence control of the amp's tone.
Also, it should be noted that the manual states you can bridge the two channels of this amp to double the power into single channel speaker system. Personally speaking, and I may be completely wrong about this, but I wouldn't recommend it. Bridging both channels seems to bring about the failure of the power transistors on one side of the amp faster, usually the right channel.
Just my .02 cents
Harley 8)
Dante:
Thanks Harley :thumb-up:
Iperfungus; I am currently running bridged mono (200w) into my 150w/8ohm EV Force speaker. I don't get the volume of the amp above 12:00, usually closer to 10:00.
MarshallJMP:
I think I know why the B channel gets blown when it's in bridge mode. Problem is that the output of the B side is connected to the sleeve of the speaker jack. Most of these jacks are metal so if something is touching the jack that is grounded it can blow up the B channel. So best is to isolate the metal part of the jack.
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