Well, finally we did the instalation of the VVR on the DC30. We did the whole amp scalling.
BTW thanks to all who shared info on this forum about this one! Nik was a lot of help too, as usual!
As a rookie, I needed some help to descipher Dana's installation intructions...
At the end, the instalation seemed simple, but we did not want to blow anything on the way!

This VVR is amazing, I have never had the chance to crank the EF86 channel on band practice. I did all of my gain tones with pedals. Last saturday that I tested it with one band, it really shone! Finally this organic lovely distorted tone without loosing definition at any volume. The amp, is a whole new animal, this works real good if you want to push the amp wihtout blowing your (or your neighbors) ears...
The TopBoost channel did great tones too, thou the difference on volume between the 2 channels was more noticeable when scalled. Great tones too, anyway....

I a/b it with the original MV (we left it there, just in case), and definedly the VVR is a winner when taming the beast without tone lose... the MV, as well known tends to suck bass freqs. The VVR respects the tonal integrity of your sound... even when in minimum (10% of the amps total power). Last night I was practicing at bedroom levels, and it was a great tone.

Just wanted to share, this is a great mod IMO...
Cheers!

Yeah, this works incredibly good. I don't how the DC30 would sound with an conventional attenuator as I never tried it. But I don't see the need at all. This is  something to consider on every amp, its a shame not being able to crank an amp to get this unique tones!

This is the link to Hall Amplification. Dana will send you enough info, and answer your questions

http://hallamplification.com/main.html?src=%2F#2,2

Well, this is the layout I made for myself as I understood what Nik and Dana were telling me about the installation of the VVR controlling the whole amp. It is based on Nik's original layout of my amp.  Basically the VVR goes after 1st filter cap and before output transformer. Also, the VVR goes before the choke, as you can see it on the layout. A 1meg resistor and a 0.1uf cap were added before pin #2 on the 1st and 2nd preamp valves (12ax7). The 1meg resistor on the input jack can be used for the 1st valve, Dana recommends, just moving it.
If you plan to do this, please reffer to Dana's instructions and maybe comment it to Nik, as you can have good assistance.



Good luck!

Hey Alwalt,

The deed is done and what a improvement. We had a power brake on it before , but the amp still lived in the garage.

I built a nice cabinet so it could be a piece of the den with looking like something that belonged there. Ian has other amps to travel with.

Like anything you do the first time I would install it a little different the second. For some reason I ended up with a populated  Fixed bias board with the dual pot ( I bought it a year ago). I installed it under the Power cap board with the FET sinkeded to the chassis there. When putting the cap board back on found the trimmerpot too tall to secure one end. If it was the right board it would be OK.
I also removed the Master ckt and installed the remote pot in the master hole.

If I did it again I would use a single Pot ( A ganged pot  came with it), and soldered the Fet so it would be the lowest profile to go under the cap board. Also order the right board in the first place (My Fault).

Final conclusion is the amp sings, before it was so loud the drum heads and glass and everything in the garage resonated. In a closed room without allot of odd shaped reflecting walls, you can really hear the attributes of this ckt. This is a lifetime amp.

The 4 tubes with the VVR is a sweet sound. I was thinking about a 18 watt with a VVR, but now thinking of a 36 watt with a VVR. This could be a whole new thread!


PS - the Gain channel with an LP and a Green Ringer (Christmas present) is a good sound.

PSS- I also installed Mogami shielded cable when I had it apart. There was a hum that showed up only once in a while, crossing my fingers on this one.

Do you have clear ceriatone dc 30 layout of dana's vvr installed.


                                      Thanks

Every control keeps working the same. Even the 15/30 watts switch. The MV honestly it's no longer necessary as the VVR takes care of volume with minimal coloration of tone.

let us know... You will love it!