Before going any further, I would check for DC voltage across the speaker leads. Disconnect the speaker and take a measurement. It should be zero or close to it.
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Show posts MenuQuote from: Loudthud on December 02, 2022, 07:45:55 PMFrom your description, I would say the amp is acting normally. What would you have it do differently ?
Quote from: cdparady on November 18, 2022, 04:00:15 PMYah figured....
I have not gotten into it yet, guessing final blown but we will see.
Thank you !
Quote from: Tassieviking on November 12, 2022, 09:04:06 AMTo me they look like clipping diodes, stick some sockets in the holes and then you can experiment with led's diodes etc.
If you get a row of SIP sockets you can break them off individually and solder them in.
They might also work as a signal limiter so the signal after this stage stays below a certain level, the led's would start conducting at a certain voltage and thus limit the voltage going to C9 and C10.
Quote from: Tassieviking on November 12, 2022, 09:30:27 AMI'm not sure how much this one cost.
10 off 12 watt PCB's US$ 11.40
10 off 12 W front facia PCB's US$ 18.60
5 off Lab Series L4 PCB's US$ 8.00
Shipping cost US$ 23.10
I have most of the components, but I had to order some pots and transistors for them.
I also bought a toroidal transformer for the Marshall 12 watt, 30V CT 50VA.
Quote from: Tassieviking on November 10, 2022, 04:38:11 AMSlowly making progress, I got some PCB's made so I can test make some.
I ordered the PCB's from JLCPCB and picked the cheapest shipping, I have too many other things going on so I was in no hurry to start.
They got to me faster then I thought so now I have to get some components I don't have on hand.
I also found a circuit for the 12 watt Bass amp so I modded the PCB so that can be build as well as all the other 12 watt Marshall circuits I found.You cannot view this attachment.
I made a PCB for a front panel as well, I always wanted to try that out.
I also got some Sound Lab L4 Bass pre-amp PCB's made for an experiment, I don't know if they will work or not but I added one LM13700 chip instead of a CA3080 and a CA3094 as original. I am to lazy to breadboard the whole pre-amp to try it out because it is so bloody big.
Quote from: Lex on October 28, 2022, 03:13:34 PMHi, and thanx for the link.
Nice to see it here, kind of a relief for me cause Im also in the process of learning and understanding gear (and music [/sound]). But with a difference that im not a musician but a bedroom player.
I've been quiet here on the forum but reading posted stuff. Realised that I have too many questions and too little knowledge. So I would put my self in the shoes of that guy. Many of his ideas from different videos I was already preparing 'to ask..' but I figured out its better to try it my self first.
Failure is the best experience and education.
So instead of asking '.. how to modify.." I decided to get few inexpensive amps and then to learn what I hear / why, why I like something and why I dont. Playing different guitars (thats now all the other story) through them I started to learn and understand about what I hear, and then how to change what I hear, to how I would like to hear it.
Then taking a wire out to a 12" external speaker/cab to compare what I hear .. a world of a difference and knowledge is opening. Still learning and experimenting.
Currently building a cab that will hold an exchangeable front with a 1x12" or 2x10" or 4x8". And also a cardboard test cab too.
Zoom G1/B1 xOn comes here as an inexpensive but useful tool for learning amp/cab simulations and adding some useful effects above it.
So to sum it up, for me it's: WHAT i hear, why I hear it and how to make a difference between 'good' and a 'bad' sound'.. (bad as not acceptable at the moment).
Lex