Sluckey's Dual Marshall

[Guy77]

Hi, great looking build.

Regarding getting standoffs for your future builds. I buy here. They actually come to you fairly quickly too.

https://www.ebay.com/itm/120Pcs-M3-Male ... :rk:1:pf:0

Cheers

Guy

[pompeiisneaks]

Hi, great looking build.

Regarding getting standoffs for your future builds. I buy here. They actually come to you fairly quickly too.

https://www.ebay.com/itm/120Pcs-M3-Male ... :rk:1:pf:0

Cheers

Guy

Excellent, thanks!

Phil

Sent from my LG-H932 using Tapatalk

[pompeiisneaks]

And the sad, sad end:




~Phil

[Reeltarded]

ouch

[cxx]

And the sad, sad end:




~Phil

Something similar happened to me. I was using an old vc3112 that was falling apart for the chassis and transformers and switches etc. for a rocket build. Both were 4 cathode biased el84's so a pretty good match. I built the whole thing, went through the first power up sequence, which worked out, but it sounded terrible. I spent quite a few days trying to debug it. Finally I gave up and figured it was something I had done wrong that I just couldn't see. I decided to try another amp using the same chassis and transformers. I think it was a simple blackface fender. Got finished with that and it sounded just as bad.

Turned out to be a bad output transformer. I measured right, but when in the amp it was bad. Swapped it out and it sounded fine. I never did go back and build that rocket.

[pompeiisneaks]

Yup and I just took the time yesterday to double check the PT. It's roasted.

I de-soldered and covered the leads to the B+ and 6.3V wires, connected a 3A fuse, and an inline ammeter and brought it up on the variac, by about 70VAC input it was at 120 to 200mA current with nothing attached. As I got closer to 120V it popped the 3A one all of a sudden in the variac itself, I guess it just went first before the other fuse I had /sigh.

AT any rate, it's definitely toast and I don't want to spend another 120$ on the amp at this point. Maybe somewhere in the future.

~Phil

[pompeiisneaks]

Thanks to Jelle, I got a new PT, and finally finished the build:




~Phil

[pompeiisneaks]

I finally got around to doing a demo video, enjoy!




~Phil

[Guy77]

Thanks for posting Phil, sounds great! This amp sounds like it really wants to be opened up to 10!
I bet it would sound incredible cranked all the way up into a 4x12!

[pompeiisneaks]

I'm sure it would, right now I've only played it into my 2x12 with the PPIMV at maybe 1/3 up on that video. Sounds pretty damn good there and in not deaf lol

Sent from my LG-H932 using Tapatalk

[Guy77]

Oh yes 2x12's are great, that's what I use in the house, no room for a 4x12 unfortunately.
I think an Attenuator might be a good addition for an amp like this. Maybe an Airbrake like the one documented in the Trainwreck files here.
Get those EL34's cooking a little more at lower volume!


Cheers

Guy

[pompeiisneaks]

I've heard that pushing the output section create's it's own magic, I definitely don't really want to try that at home w/o an attenuator, but I don't have one... yet?

~Phil

[SPeter]

To the attenuator topic: I just got a used THD Hotplate for the JTM45 I built and so far I like it. I'm using its line out into a DAW with free speaker IRs. The THD can be turned down to zero output for silent recording and sounds quite good through the monitors of the speaker. The hotplate also doubles as a stepped attenuator which combined with the PPIMV sounds pretty good through the cab. Used price $200. The only problem is that it is fixed impedance.