Simms-Watts PA 100 No.2 - New clip!

[Hermansson Amplification]

It’s time for another Simms-Watts PA 100!

It will of course be something completely different than a pa amplifier.This will be the most complex build so far on my work bench! Three channels with separate gain, eq, volume, and voicing-switch. Two master volumes, tube buffered effects loop, mute-switch for the power amp. MIDI-switching for the three channels, the master volumes, the effects loop, the mute-switch and for a gainboost on channel two. All this functions will also be switchable via a standard ”Marshall footswitch”. Two EL34′s and two KT88′s in the power amp and of course some more switches and functions to shape the sound of the amp.

First of all, I took out all the old stuff in the amp.

I have added three preamp tubes to the preamp.

I will start to build up the powersupply.

And fit some point to point boards to build up the amp on.

When I’m finished with the drilling it will be at least twenty new holes in the front panel

 

[Devilinside]

Awesome man, can't wait to hear the finished product

 

[Sierra Voodoo]

Damn I wish I could be there to watch and learn!

 

[Shark Diver]

These are so cool.

 

[mooncobra]

this dudes amps sound great!! check out his blog and clips.

 

[mooncobra]

partridge transformers?

 

[glassjaw7]

Henric's amps sound so killer in every clip! BTW this is one of the coolest looking amps ever!

 

[cheftie]

Just seen there is progress with the amp and more pics on the way. I'm sure Henric is going to post an update to this but I couldn't resist
Hope you don't mind, Henric

Looks absolutely stunning. Wait for the pics

 

[AmpliFIRE]

DIBS!!!!!

 

[mindseye]

This looks like it will be killer!!!
Cant wait to hear clips so I can have something new to GAS for!!

 

[MichaelG]

I LOVE these Sims PA re-build threads.... The finished product is so different looking that it makes you go "WTF??" and then you hear the clips......

 

[Hermansson Amplification]

Yes, here are some fresh pics for you!

I have drilled all the holes in the front panel:

And started with the preamp:

 

[cheftie]

I told you guys.
Just wait for it to show its face and voice!!!!

 

[pstar]

henric, see u r keeping busy. Cool build.

 

[tokyo tapes]

See the NO NO sign at the far left? Seems like sound advice

/Ulf

 

[Hermansson Amplification]

I have continued with the preamp:

 

[Hermansson Amplification]

Just a few hours of work left until it’s time to put in the tubes and start it up for the first time!

 

[cheftie]

Have you fired it up yet?
Can't wait to know your first impression.

 

[Hermansson Amplification]

Have you fired it up yet?
Can't wait to know your first impression.

I found out that one switch on the MIDI-PCB was broken so I have been tearing my hair out since I woke up today to resolve the problem, after hours of thinking and reading datasheets I found out a solution! The transistor pulldown IC had two unused outputs so I cut some tracks on the MIDI-PCB and wired some new cables and change half of the switching circuit (because the old one drew to much current) and now it's working!

I have only played your amp whisper quiet since it's in the middle of the night but it sounds impressive so far! Super tight with growling mids and great bass response.

/Henric

 

[Jeff Hilligan]

Just to be clear.........




You suck!
I kid your a mad man with the work u r doing with these amp builds!