Amp has been sold in the meanwhile for 2200euros
Apparently it was an early '68 plexi 50w.
specs: no bias pot, B+ voltage was around...
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late 60s Marshall JMP
I'm having a look at a late 60s jmp 1987 model.
Can someone help me with dating the amp or estimating its value?:
- SN: S/11170...Last edited by shagual; 11-06-2010, 07:04 PM.
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I'm not sure the powertransfo can handle a 5U4GB, it's already running hot. (PT is non original, 240 ac convertion done in the past).
B+ is...
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all pots were fine, were never modified.
circuit was 100% original, only a dubble bias pot was installed
Did replace...
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Thanks Bruce,
its using a GZ34 rectifier.
I do measure the output the following way, input signal of 100mvac, dummy load of 8 ohm. I...
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Silverface Deluxe loud
A good friend dropped off a deluxe reverb from (I guess) '79. Its got the line out & the volume boost push Pot.
I've got building experience...
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just did some tests.
I was inserting a 1KHZ signal to measure the amps power.
when pushing the treble from 8 to 10 (volume was...
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indeed, I measure approx 32 watts on both channels.
Turning up the treble cuts off all signal.
I'll check the wiring of the tonestack...
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I'm having serious drop of output, like going from full power to zero when just turning the treble a bit up.
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deluxe AB763 problem
Hi,
I just finished a deluxe reverb AB763, did check up all the voltages and I'm everywhere between 5% of the original, reverb works, vibrato...
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Thank you all.
I made a summary of all the voltages I'm getting compared to the current Custom Shop and from there on the voltages with a NOS...
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Thanks,
well the old meter is a pretty cheap instrument but it gave me a perfect 6.3 on the heathers when I wired my PTs on 230AC with around...
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5E3 voltages
Hi,
I've built a 5E3 some time ago and all seemed to be perfect, but today I bought myself a new multimeter (Fluke True RMS 175) and went through...
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if your living in the UK, check allparts UK.
They have MOJO KITS, you won't pay import taxes and shipment was low.
components are fine...
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thanks,
easiest fix ever I guess.
The last thing I wanted to check is the grounding of the preamp & output section.
...
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5E3: volume pot interaction
I'm trying to get my 5E3 better and better by taking out little bugs.
all voltages are great, biassing seams to be around 39.8 - 40.6, so i'm...
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Thanks MWJB,
I'm now measuring 6.3 on the heathers.
These are my last measurements with 230ac from the wall, normally these...
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We are getting around 234 AC from the wall, I connected the PT on the 240tab.
Connecting it to the 230tab will raise the filament voltage,...
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Filament Voltages
Hi,
I guess this my first post. First I want to thank all the members on this board for your valuable input, it was a great help building my...
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