Hi Guys

Mats A wrote:You mean there are some difficulties in installing Power Scaling in a VM?

None that I can see.

Have fun
Kevin O'Connor

Hi Guys The whole BF vs SF debate is bogus. It began when Fender made changes to the circuits and the look, and was a repeat of complaints when they went from "tweed" to tolex. You can have Fender clean and Marshall crunch from any of the two-channel Fenders that have separate EQ for each channel. I...

Hi Guys

It is single-ended, so it is class-A.

Operating class is kind of irrelevant inasmuch as you should just concern yourself with the tone rather than how it is attained.

If ethics are of any concern, you might boycot Blackstar, Bugera and Behringer.

Have fun
Kevin O'Connor

Hi Guys As we showed in the Dumble chapter of TUT6, the overdrive section really cries out for another control - let alone its own EQ. But... The topology evolved from modifying Fender reverb amps - just as the Mesa Mk1+2s did. The goal was to get the sound of a cranked amp but with control over lou...

Hi Guys

There was a guy who was interested but I never heard back from him. The closest is in The Netherlands, called Ed's Custom Shop run by Ed Thoen, or the guys in Sweden and UK.

There is a list on our site.

Have fun
Kevin O'Connor

Hi Guys The separated cabinets will provide a huge sonic benefit whether you run stereo signals or not. Using multiple amps to drive them allows you to zone the stage and control loudness over the area. As far as the "stereo-ness" you refer to, do you have some stereo effects? Most stereo effects ap...

Hi Guys The YJM reminds me of my first amp, which was a Traynor 80W Bassmaster. This is the same circuit as every plexi but built with bigger transformers. I made a "hair-ball" preamp on a piece of plywood, that had a 4" spring reverb with differential drive and pickup. As a beginner player, I liked...

Hi Guys Steve said: "HT (B+) voltages in the Vintage Moderns are; - 2466 (100W) = 530V 2266 (50W) = 440V" This suggests that the OT primary is the same for both models and could potentially be the same piece. One way to double the power output of an amp design is to scale the voltage and current up ...

Hi Guys To change the turn-on default, some options come too light looking at the schematic for the switching circuit. The first is to swap the positions of R73+C33 with those of C65+the panel switch. The rest of the circuit will follow along with inverted voltages. This may create too-slow of a pos...

Hi Guys Wiring a triode-pentode switch is very simple. You need a DPDT that has proper safety approvals. The latter suggests that the switch is sturdily built - enough that the manufacturer paid for the approvals. Becuase of the high voltages on this switch, this should be a "large" body switch, not...

Hi Guys It takes 40-100 hours of use to break in tubes. During this time, they will lose gain and lose treble response. 12AX7s and ECC-83s will have the most noticeable reduction of gain, but you should end up with a smoother sound with a bit less noise. Fizzyness might also reflect the output tubes...

Hi Guys Radio-breakthrough happens for a lot of different reasons. You've eliminated the cable by swapping it out, which is good. Tubes are always suspect with any ill performance in a tube amp and these are easily swapped around. Despite being a new amp, a bod solder joint can cause this symptom, a...

Hi Guys 3W compared to 100W is "quieter" for sure, but not necessarily what you might consider to truly be QUIET. 1W through a typical guitar speaker produces 100dB of sound. That is loud enough that you have to be shoulder-to-shoulder shouting to your buddy to be heard. Regarding tubes: Once your t...

Hi Guys The VM schematics I've seen suggest that both the 50W and 100W versions operate above 500V on the output stage. But if Steve says they are different, then they likely are. His numbers above suggest that for the 2266 you would need the SB-1 and RBX, and for the 2466 you'd need the SF-1 and RB...

Hi Guys With respect to setting the Power Scale and DriveComp controls: To maintain the loud sound, you generally set PS and DriveComp about the same as you dial down. There will be a point where you dial DriveComp less. You can use either control individually to create different sounds and other ef...