Hi all, anyone have a schematic for a Eden Nemesis NC200 from around 1996 or so? Was able to buy a well worn one from a friend and it has a few weird noises. I can't find anything but schematics for the WT series. And Eden won't send schematics to customers. Thanks for any and all help!
Could someone tell me what capacitor or resistor I would Change out to change the sound of the voicing switch. Would it be c26 or c29 or r34. I would like to cut the mids some more thanks.
I have found these operating instructions for the ROZZ RGA 6TB/10TB in my documents.
This was a combo amp that a friend of mine had in his music shop in the early 1980s.
ROZZ RGA-6TB-10TB Manual.jpg
ROZZ RGA-6TB-10TB Schematic.jpg
Hi everyone. I'm dismantling and tracing a Blackstar Fly 3 amplifier (see thread here: and here: ) and I am looking for the pin-out for the 7-pin PCB pots used by Blackstar - pictures from above and below PCB follow:
Blackstar_PCB_pot.jpg
Blackstar_PCB_pot_under.jpg
I know this is a dual gang (tandem) pot and I think it is the same pot used by Marshall for Master Volume in some modern amps (DSL 401 ?)
Does anyone have a pin-out for this pot?
I have a feeling one pin is a dummy leaving 6...
I'm beginning to plan for features for a dream amp. Could be long, long off but here I am wondering - I'd like a decent bit of switching capability. I'm gonna keep it short.
What is the best way to perform switching at high voltage like seen on an amp with a minimal footprint? Is it relays?
Say I wanted many smaller options - would 100v/1amp or 50v/1.5amp DIP switches such as these or these work?
Do I need a vDC250 switch for pretty much all switches or mostly just ones with Plate voltage?...
Hi folks
Every now and then, one has an eureka moment that one feels like sharing, but sometimes the fear of being severely flamed forces one to keep it to oneself.
After servicing tube guitar amplifiers for close on 40 years, I have decided to share a very simple component change that I discovered a few years back, because in my humble opinion, it makes a very large tonal difference, but first, some background :wink:
Have you ever wondered why those British tube amplifiers from the 60s sound...
A friend of mine sent this to me today. I thought I would pass it along as I really love the way these amps sound and I think you will too. I'll leave this up for a few days, if someone else can host it after that would be great.
My brother in law got his hands on a Newcomb AV-10 all tube record player, and he loves the way it sounds playing his guitar through it. He says the distortion is awesome. I attached a copy of the schematic.
Would a buffer before the amp be used?
Is the distortion from this from the power tube (EL34)?
Do you see any improvements needed to this amp to work with a guitar?
I just got one.........soooo gooood....sexy.....no need for pedalls.....loud.....awesome!!!
soon pictures.....I love EH stuff...
does someone have schematic? it is black...guitar version from 1970/es.....AC powered...
I have a homebrew JCM800 2204 (no fx loop), that I built out of an old Fender Bassman head. I am attempting to run it into my Weber Mass Lite 100 at full attenuation with no speaker connected. I then run the line-out of the Mass into my time based fx (just a carbon copy for now). The fx then go to my Fender Bandmaster and into a speaker cab.
The line-out signal is too strong for the pedals, so I swapped the 10k/1k voltage divider with a 100k/1k. The signal is still line level. It's like there...
Total newbie here. Here’s the story: I had a spare small speaker so I thought, why not buy a little amp circuit to use the speaker, build a little enclosure and hey presto, a small guitar amp for the caravan. So I bought a Noisy Cricket amp from Fuzzdog and am waiting for it to be delivered. Just wondered if anyone had built this and how they found it. Any problems?
Does the IC come with a socket or do you solder directly to the PCB.
OK.
I know.
I stayed with the single ended concept.
Got me a 125ESE just in time before lockdown. Wired some mods, JJ tubes and Bam! great improvement in sound.
90623729_633005710851666_7797463742354030592_n.jpg
Schematic as-built:
VJR3 mod SB.jpg
Now I wonder whether a blocking resistor before V2 after the volume pot might smooth the sound even more.
Is it worth it?
A while ago I got a rack unit with this toy, well, to be precise it's actualy the chassis containing the transformer and an empty pcb.
I was curious about the schematic, but that was a dead end. At some point, in the forgotten depht of the internet, I came across the schematic of the Ibanez Starfield SVA1, it's a 2x50W valve amp and preamp, and the preamp has the same controlls as mine. I compared the first part of the preamp schematic with my empty pcb, looks like the preamp is the...
Hi there.
Is there any good working guitar power amplifier layout (or simple schematic)?
Around 50-100w . Small size would be more preferable.
I just need to have my preamp and power amp on my pedal board ((or being able to carry them easily) and plug directly into a cabinet (8 or 4 ohm).
Thanks in advance.
I really want to transform my Valve Junior into a push pull amp.
Preferably EL84 again, but suggestions are welcome.
Can I use the power transformer? It is rated 260V at 0.09A (23.4 Watts)?
6.3V Filament power is not an issue. It's got plenty for that.
the issue is I need a power amp with voltage supply LOW enough to meet the current draw restrictions. This is 90mA, yet with the preamp in mind, I think this should be 85mA max.
The lower output as trade off is completely acceptable,...
Hello all I was wondering if anyone knew of any good books on the subject of power supplies in tube amps. I been planning on building a preamp section of a Laney Supergroup LA60 which looks like it is close to a Marshall with a few value changes. I imagine there’s really no one size fits all power supply to power it all up so I imagine I’d have to read up on the subject if I wanted a power supply that wasn’t noisy and powers the whole thing efficiently. Also a question I have is on the LA60 I...
i have this transformer with primary 220 volts and the secondary output is 18volts and its 3 amperes ..i want to ask anybody what kind of diode bridge i will use?? how many ampere of a diode bridge need for this 18 volts 3 ampere transformer..???
im gonna use this power transformer to power up the power section of a LM1875 power amp with 20 watts output on the speaker...any advise??
by the way are the other components right?? epecially the two plate resistors??
power...
This is a cheap little 5W chinese head I picked up in 2018. It was $99 shipped! The seller was even nice enough to send me the factory schematic on request. :D (attached)
Here's the specs:
• 5 watts via 1x EL84 and 1x 12AX7 (Chinese tubes, of course)
• Treble, Bass, and Volume controls
• 1W and 0.1W attenuation modes (slide switches on rear)
• 8 and 16 ohm outputs
Not a crazy complex amp, but definitely not just another Valve Jr variant. It's definitely worth $99 at the very least.
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