Whats on your amp workbench?

Amp tinkerers and people who aren't afraid of 700 volts or so in here....

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PaulWD
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Re: Whats on your amp workbench?

Post by PaulWD »

Starfire wrote: Mon Jul 05, 2021 5:41 pm Tone is in the mouse piss?
Maybe, but I wasn't game to power it up.

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Re: Whats on your amp workbench?

Post by kdawg2a »

PaulWD wrote: Mon Jul 05, 2021 5:08 pm Loosely based on a '39 Gibson eh185. Donor chassis did PA duties in the 40s at a country dance hall. It had been sitting in a farm shed for decades and was full of mouse piss and spiderwebs.

Power transformer is American as are the sockets. They came up good with a clean and test.

I have a 40s em Jensen speaker to go with this. The field coil has been rewound by a radio friend and will be a good match for the amp.

Tube lineup 5z3, 6j7, 6n7, 6l6, 6l6.

Aiming to have this and a few others finished for gearfest.

IMG_20210705_164227.jpgIMG_20210705_164055.jpg
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I would LOVE to give that a hoon. I bet a P90 equipped guitar would suit it well.
1935 Martin D-45, 1942 Gibson Southern Jumbo,1950 Fender Broadcaster, 1954 Fender Strat, 1958 Gibson Moderne prototype, 1959 Gibson Les Paul Standard.
1958 Fender twin, 1965 Vox AC30, 1966 Marshall JTM 45, 1977 Dumble OD Special.
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Re: Whats on your amp workbench?

Post by Slowy »

PaulWD wrote: Mon Jul 05, 2021 5:08 pm Loosely based on a '39 Gibson eh185. Donor chassis did PA duties in the 40s at a country dance hall. It had been sitting in a farm shed for decades and was full of mouse piss and spiderwebs.

Power transformer is American as are the sockets. They came up good with a clean and test.

I have a 40s em Jensen speaker to go with this. The field coil has been rewound by a radio friend and will be a good match for the amp.

Tube lineup 5z3, 6j7, 6n7, 6l6, 6l6.

Aiming to have this and a few others finished for gearfest.

IMG_20210705_164227.jpgIMG_20210705_164055.jpg
IMG_20210307_122736.jpg
Perfect amp for playing 'Live Rust'!
"We were playing so loud that just one note on the guitar was sufficient".
Ritchie Blackmore.

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Re: Whats on your amp workbench?

Post by PaulWD »

Dug out an old cab. The cloth behind the grille has gone, I'll replace. Thinking that I'll just give it a light clean rather than repaint. Because the HT is going down to the speaker, I've decided to fix the head to the cab. I don't like the idea of a socket getting unplugged and replugged.
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IMG_20210707_184334.jpg (4.67 MiB) Viewed 1269 times
Excuse the messy workshop.

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Re: Whats on your amp workbench?

Post by Jay »

Designed a new face plate for the Jansen 4/12 copy to accommodate the Gain and Master knobs. Got it engraved and put it on yesterday. Me think it looks good :D

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Jansen 4-Twelve - New Faceplate JAY_1047.JPG
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Re: Whats on your amp workbench?

Post by griff »

Been working on my SLO clone over the last few days. Jet City HDM with upgraded pots, caps and some resistors. Circuit is now identical to SLO values (Thanks to Optical for his advice there)
Also put a new Hammond choke and OT in. Last night I actually put the stock tranny back in because of how much more it bites. The Hammond is great but just a little too smooth.
This thing is so damn loud. On one it hurts my ears. I run it through Fryette PS and holy shit, so good!
No need to mod this beast any more, its now gone from a great to an awesome amp.
Practice tonight with the boys for the first time in ages. Looking forward to it.
No pics because I cant be bothered.

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Re: Whats on your amp workbench?

Post by Mattallica »

Which Hanmond OT is it?

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Re: Whats on your amp workbench?

Post by griff »

1760W

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Re: Whats on your amp workbench?

Post by Optical »

It's funny in my SLO clone I like an output transformer with less primary impedance (Marshall spec) for the same reason, less smooth, more bite and aggression. I'm not sure what the specs are on the jet city trans but would make sense.

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Re: Whats on your amp workbench?

Post by MikeC »

The Hammond 1760W has a 2K primary which is correct for a SLO but I too wonder about the Jet City OT primary.

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Re: Whats on your amp workbench?

Post by griff »

I can have a look. Stock tranny is far louder too, and much larger. But yeah, more character for sure. Hammond is still a great unit for not much money.

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Re: Whats on your amp workbench?

Post by MikeC »

griff wrote: Sat Sep 11, 2021 2:32 pm I can have a look. Stock tranny is far louder too, and much larger. But yeah, more character for sure. Hammond is still a great unit for not much money.
It would be interesting - if you're still learning you're living!

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Re: Whats on your amp workbench?

Post by griff »

1.4k for the stock tranny

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Re: Whats on your amp workbench?

Post by griff »

Does that also account for it being louder/more efficient?

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Re: Whats on your amp workbench?

Post by MikeC »

griff wrote: Sat Sep 11, 2021 4:46 pm 1.4k for the stock tranny
Did you get this info from the schematic or have you measured it somehow?

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