First 12 series build

vh junkie · Post by **vh junkie** » Thu Jan 01, 2015 9:47 pm

So... what was the problem?

Lbrown3743 · Post by **Lbrown3743** » Fri Jan 02, 2015 2:55 am

There was a few things wrong. The main thing was the PI filter cap was wired backwards. My mistake. Once i got that fixed i had no voltage on the plates of v1. Decided to completly remove the board and re look at everything. Found out that the bus wire for v1 went to the input terminal instead. So fixed that. Then i played it for a few minutes and the PI tube went bad. Changed it out and its working now. The dude i bought the board from on ebay has nothing but great reviews. I should have just built it myself. I bought one more board from him a few ago for my next build. Hopefully it works as advertised. I learned alot from this build. Exactly what i wanted. Thanks to everyone for the help. I took a 450 volt jolt today for the first time this Morning. Goodtimes. Didnt hurt. Just scared me. Great for recalibration of my appreciation for high voltage. Ill start fine tuning it tomorrow and post some clips. Thanks everyone for the help.

vh junkie · Post by **vh junkie** » Fri Jan 02, 2015 6:55 am

So instead of going to the junction of the 100ks for v1, the under-board B+ was going to one of the 68k (input) junctions?

Lbrown3743 · Post by **Lbrown3743** » Fri Jan 02, 2015 7:33 am

Yup. The board looked badass to. Mil spec wire, sozos snd mullards. The dudes has sold tons of them. Guess he just had a bad day. It could happen to anyone. I have another one in route from him for my next build. Im sure it will be good.

Lbrown3743 · Post by **Lbrown3743** » Sat Jan 03, 2015 4:22 am

I think it sounds ok. I'm going to put some hours on it first then go from there.

https://soundcloud.com/lbrown3743/rwtd

Strat78 · Post by **Strat78** » Sat Jan 03, 2015 10:12 am

The voicing and feel of the amp is all there.

Right out of the gate, that is the tone, that is what a 12xxx is supposed to do. Compliments on a great build! Whats your next build? Do the boards yourself, that's where the fun is.

Lbrown3743 · Post by **Lbrown3743** » Sat Jan 03, 2015 5:52 pm

I got a 69 kit coming with heyboars. Im going to do the board this time.

Lbrown3743 · Post by **Lbrown3743** » Mon Jan 05, 2015 5:41 am

Got about 40 hours on the amp. It sounds slightly different every day.

Made another clip with some reverb. Dimed.

http://soundcloud.com/lbrown3743/doctor/s-J6lii

What do you guys think? Im surprised by the amount of gain im getting. Im liking it.

rgorke · Post by **rgorke** » Wed Jan 07, 2015 10:09 pm

Wow!! Well done. The difference between your first clip and this one is huge. So what is the full signal chain? Guitar to amp to cabinet? What pickup? What cabinet?

Lbrown3743 · Post by **Lbrown3743** » Wed Jan 07, 2015 11:15 pm

guitar is a floyd rose Fender Strat with a rose wood fret board

pickup is a 79 EV Brown sound by S.I.N.

Forgot one thing the signal is going from the guitar through a Boss Ge-10

Amp is fed into a THD hotplate then into a 1960Ax Marshall cab with greenbacks

SM57 mic into garage band

I need to find a place to set up the full stack and dime it with no attenuator.

got a variac of amazon the other day. Cant wait to play around with that and see what happens.

Ive never been able to really tell the difference between transformers until M e r r e n. That dude is the man. Awesome customer service.

Strat78 · Post by **Strat78** » Thu Jan 08, 2015 12:00 am

Sorry for the late reply. When will I learn that the VH sections are useless here. It all happens down here in the basement anyway. The clip is great! You have reminded me that Chris' tranny's are the shit. He seems to be the only guy producing the right classic 50w tranny's too. I just wish he would settle his affairs with Neikeel, because Neil deserve to be treated better than that! Hey, grab another variac, this time an old Ohmite and use it between the head and cab, it's a great effect for sure.

Lbrown3743 · Post by **Lbrown3743** » Thu Jan 08, 2015 1:01 am

There is a bunch of Ohmite's on ebay. Which one do you suggust for use between cab and amp? Do you just cut the plug of and install a 1/4 female connectors for the input and output?
Whats amperage would you suggest? Im thinking a lower amp model for between the amp and speaker. I got a 7 amp one for the amp itself.

Jeremy1283 · Post by **Jeremy1283** » Sat Jan 10, 2015 10:14 pm

Killer build.. Sounds great.. Get her variaced down :rockon:

Lbrown3743 · Post by **Lbrown3743** » Sun Jan 11, 2015 3:56 pm

Hopefully ill get it today.

Lbrown3743 · Post by **Lbrown3743** » Tue Jan 13, 2015 1:20 am

Variac just arrived. Now have to sneak out of here so I can go try it out.

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First 12 series build

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