Marshall Neanderthal by Ivanberg - Build Thread:

[Inspector #20]

This is a cabinet made by Guitar Cabinets Direct. All I did here, was add some finishing washers to those oval head screws. A couple years ago, I ordered a combo 1x12 cab from GCD, and those oval head screws were used to secure the back panels. Without those finishing washers for the oval head screws, the screws can easily be driven too deep through the tolex and through the thin and soft wood of the back panels. Plus... the finishing washers makes the hardware look more, uhm, finished...

Everything Greg touches turns to gold.

 

[syscokid]

Everything Greg touches turns to gold.

 

[WavMixer]

View attachment 83344

Is this how @Goldmember was created?

 

[Inspector #20]

By the way, @Don O fixed the 8200!!!!!

 

[Inspector #20]

More amazing craftsmanship by @syscokid

 

[Inspector #20]

 

[Inspector #20]

Metro FX Loop mock-up....

 

[Inspector #20]

Man,

I love that red and black!!!!!!

 

[Don O]

Man,

I love that red and black!!!!!!

View attachment 83787

Those were my high school colors. The cheer at football games was:

oomph, um-gow-wa
black and red power

 

[syscokid]

After four months, the Marstran trannies have arrived...


Now, where the Hell did I store all the other parts for Robert's amp...

 

[67plexi]

Should be interesting what the B + 1 voltage under load will be ?? the last set I got from Marstran
was lower than past orders.

 

[Ghostman]

That's more Iron than a 1957 Buick. Nice.

 

[syscokid]

Should be interesting what the B + 1 voltage under load will be ?? the last set I got from Marstran
was lower than past orders.

Yeah. I won't know till I power up the PT. Notice that Marstran's wiring diagram doesn't show the spec for the HT voltages before the rectifier:

 

[Inspector #20]

Since the set of Marstran transformers isn't expected to arrive till late June, Robert's future 2204 project is going into hibernation. I think the head cab should be here in a month though, and I'll do a test fit with the chassis and cab as soon as the cab arrives.

It took from March until July!!!!!

 

[Inspector #20]

Look at this!!@@!!



These high stability capacitors were used by Marshall from '69 on through most the 70's & impart a gritty, grindy type characteristic to the highs & upper mids. They are quite rare & hard to come by now.

Sent to us by @ivan H !!!!!

 

[Inspector #20]

Gotta get a name badge!!!!!

 

[syscokid]

Trannies and choke are installed, and wired up as much as possible before the loaded circuit board is installed. Then I'll put on my safety glasses on, grab a 10' pole, and use it to flip the amp's power switches on...

 

[Inspector #20]

View attachment 84910

Trannies and choke are installed, and wired up as much as possible before the loaded circuit board is installed. Then I'll put on my safety glasses on, grab a 10' pole, and use it to flip the amp's power switches on...

Wow!!!!!!!!!

 

[syscokid]

So.... This amp has been completely assembled, and fired up with no drama. The trio of Genalex Gold Lion CV4004's proved to be excessively noisy in V1 and V2 positions. Not sure if it's a defect with these tubes, or that they are allergic to the 2204 circuit. I have temporarily substituted a Sovtek 12AX7LPS in V2 and a Mesa STR12AX7A, which is a rebranded short plate JJ 12AX7/ECC83S, in V1. Amp is purring along, but still needs a proper bias.

Do you think I'm sexy?

 

[Inspector #20]

So.... This amp has been completely assembled, and fired up with no drama. The trio of Genalex Gold Lion CV4004's proved to be excessively noisy in V1 and V2 positions. Not sure if it's a defect with these tubes, or that they are allergic to the 2204 circuit. I have temporarily substituted a Sovtek 12AX7LPS in V2 and a Mesa STR12AX7A, which is a rebranded short plate JJ 12AX7/ECC83, in V1. Amp is purring along, but still needs a proper bias.

Do you think I'm sexy?
View attachment 84998

Super excited about this, Greg!!!!!!