Hoffman Amplifiers Tube Amplifier Forum

Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: kagliostro on April 04, 2015, 02:56:35 pm

Title: Observing this photo can you say which Marshall chassis is this ?
Post by: kagliostro on April 04, 2015, 02:56:35 pm: This morning I was to a radio amateur flea market and I got on the cheap a new clone chassis

the vendor told me it is for a Marshall 800, but I don't know if it correspond exactly to an official version of the 800 chassis and at which one

measures are near 640mm x 170mm x 63mm + 155mm x 20mm for the attacks - galvanized steel 15/10mm

The switch holes are round and are in the place where usually you read 800 on the faceplate - on the back there is only one hole

for the impedance selector or line selector, not both

this is the chassis

(http://i.imgur.com/S7sOdCx.jpg)

(http://i.imgur.com/td1QUVr.jpg)

(http://i.imgur.com/zpXHKtC.jpg)

(http://i.imgur.com/mKHDV8e.jpg)

Thanks

K
Title: Re: Observing this photo can you say which Marshall 800 chassis is this ?
Post by: TIMBO on April 04, 2015, 03:45:08 pm: Hi K, It's probably a one chassis fits all.
It seems to have too many holes, so this may be good to give you options for lots of builds and cover the unused holes.

So don't hold back and build something AWSOME. :icon_biggrin:
Title: Re: Observing this photo can you say which Marshall 800 chassis is this ?
Post by: DummyLoad on April 04, 2015, 04:00:06 pm: marshall 1959 - super lead.

--pete
Title: Re: Observing this photo can you say which Marshall chassis is this ?
Post by: kagliostro on April 04, 2015, 04:12:58 pm: Marshall 1959 Super Lead

Ohhh YESSSS !!!!

(http://upload.wikimedia.org/wikipedia/commons/thumb/1/14/Marshall_1959_Super_Lead_100_Reissue_%282%29_Chassis_Top.jpg/800px-Marshall_1959_Super_Lead_100_Reissue_%282%29_Chassis_Top.jpg)

(http://upload.wikimedia.org/wikipedia/commons/4/4c/Marshall_1959_Super_Lead_100_Reissue_%282%29_Chassis_Back.jpg)

(http://upload.wikimedia.org/wikipedia/commons/9/92/Marshall_1959_Super_Lead_100_Reissue_(2)_Chassis_Front.jpg)

it has one less hole on the back (for line selector I suppose) and one more hole for a fourth preamp tube

Many Thanks Pete :m2

Franco
Title: Re: Observing this photo can you say which Marshall 800 chassis is this ?
Post by: DummyLoad on April 04, 2015, 04:14:49 pm: YW franco.

--pete
Title: Re: Observing this photo can you say which Marshall chassis is this ?
Post by: kagliostro on April 04, 2015, 04:25:45 pm: I've find on the network prices around 100$ for that chassis, so my investment of 20€ was a good investment :icon_biggrin:

Franco
Title: Re: Observing this photo can you say which Marshall 800 chassis is this ?
Post by: 2deaf on April 04, 2015, 04:41:53 pm: It is identical to my JMP 100W master volume model except my power cord is permanently mounted and I have rocker switches. The round hole on the back is for speaker impedance.
Title: Re: Observing this photo can you say which Marshall chassis is this ?
Post by: kagliostro on April 04, 2015, 04:56:39 pm: on the JMP 100W master volume photo I've find the switch holes are squared, my chassis has rounded holes like the 1959 Super Lead 100W

However, 2deaf, Thanks for the answer

---

Someone has a proven layout for the 1959 Super Lead or better for the 1959T (there is the hole for the oscillator tube) ?

Franco
Title: Re: Observing this photo can you say which Marshall 800 chassis is this ?
Post by: TIMBO on April 04, 2015, 05:49:08 pm: Hi K, NAR, a QUAD of 6v6 into a plexi and a one tube reverb.
Title: Re: Observing this photo can you say which Marshall chassis is this ?
Post by: kagliostro on April 04, 2015, 06:02:25 pm: Interesting idea TIMBO

Franco
Title: Re: Observing this photo can you say which Marshall 800 chassis is this ?
Post by: 2deaf on April 04, 2015, 07:30:35 pm: Quote
on the JMP 100W master volume photo I've find the switch holes are squared, my chassis has rounded holes like the 1959 Super Lead 100W

They made master volume JMP's with toggle switches, but they only had two inputs. The actual circuit doesn't matter as long as it used six knobs and I think they called them all "Super Lead", didn't they? I just meant that your chassis is a JMP and not an 800.
Title: Re: Observing this photo can you say which Marshall chassis is this ?
Post by: kagliostro on April 04, 2015, 07:35:11 pm: Oh, now I understand

Thanks

---

I've find this layout but I'm not sure about the connections on the 2M Speed Pot

Which is your opinion ?

(http://i81.photobucket.com/albums/j205/ptpcircuits/1959layoutR1.jpg)

(http://www.drtube.com/schematics/marshall/1959tu.gif)

(http://www.drtube.com/schematics/marshall/1959t-66.gif)

(http://www.drtube.com/schematics/marshall/jtm45tr.gif)

Franco
Title: Re: Observing this photo can you say which Marshall 800 chassis is this ?
Post by: Glennjeff on April 04, 2015, 10:55:28 pm: Nice find. Kinda like THE classic Marshall, are you going to do it, I'd like to watch. :laugh:

You could get creative with using two of the guitar inputs as mix pots and make a " jump panel mixer " design like the Hoffman 6V6 input stage http://el34world.com/Hoffman/files/Hoffman_Plexi_6V6-V2.pdf (http://el34world.com/Hoffman/files/Hoffman_Plexi_6V6-V2.pdf)
Title: Re: Observing this photo can you say which Marshall chassis is this ?
Post by: kagliostro on April 05, 2015, 02:44:52 am: At the moment I'm around at one other pair of projects, but as I was lucky with the purchase of this chassis, I'm collecting info about how to use
it at best, and a 1959T seems the project for which the chassis was planned, so to find a proven layout is a must

Franco
Title: Re: Observing this photo can you say which Marshall chassis is this ?
Post by: bigsmitty on April 05, 2015, 10:09:27 pm: You can find layouts on Metroamp forum
Title: Re: Observing this photo can you say which Marshall chassis is this ?
Post by: EL34 on April 06, 2015, 12:36:02 pm: Looks like a generic 100 watt type chassis
Title: Re: Observing this photo can you say which Marshall chassis is this ?
Post by: kagliostro on April 06, 2015, 03:14:23 pm: Many Thanks to All

Franco
Title: Re: Observing this photo can you say which Marshall chassis is this ?
Post by: VMS on April 06, 2015, 03:29:31 pm: Quote from: kagliostro on April 05, 2015, 02:44:52 am

a 1959T seems the project for which the chassis was planned, so to find a proven layout is a must

Franco

Except your chassis only has 6 potentiometer holes in front and tremolo marshall needs 8, but you could sacrifice two input holes for the potentiometers.

-v