Thanks Howard

Thanks Mario!

Great to hear from you and thanks for shating. I went to Recife once!

Hi lou. I'm an electronics engineer and so frustrated I didn't become a builder5 - would have been minted by now!! :) I'm glad you're enjoyong the vids. Keep learning!

@@stuartukguitarampguy5830 Haha ! That is funny ! I love the vids ! Take care !

Thanks Michael I'm pleased you found it useful.

Excellent thanks Stephen

Thanks very much.

Excellent well done Michael.

Nice thanks.

Thanks Giulio I'm glad you find it useful.

You're too kind!

Thanks for the great feedback I'm glad you enjoyed the vid.

Thanks James. Hmm, guitar pedals are SO varied and often fiendishly complicated. They even have 100 pin computer chips and suchlike in them!

Thanks Miguel.

Excellent!

Thanks David. I wonlt be doing the class D primer - barely understand it myself!

Ok interesting thanks.

Great I'm pleased you liked it.

Thanks Peter.

Excellent thanks Kit

Great I'm glad it was helpful!

Yes that's the best method.

Thank you so much!

Cheers Ronnie

Thanks Brendan

Thanks I'm pleased you enjoyed it! Feel free to drop in if you are down my way (Reading)

Thanks Ed

Cheers Pete

Great well done Adam

Thanks Richard

Thanks John

Thanks Tomas!

Great that's how you learn!

Let's hope so!

Thanks! Glad you enjoyed it.

I'm pleased you enjoyed it.

Thanks Greg

I'm pleased you enjoyed it.

Thanks I'm really pleased you enjoy it!

Thanks Jason.

Hi David I'm pleased you are enjoying the vids! No I haven;t made any vids on the tools I use apart from the variac setup I have.

Glad you enjoyed it!

Yes that's correct. Glad you enjoyed it!

cheers Josh!

Glad you enjoyed it Roy.

Great I'm so pleased.

Thanks very much! It's the same for me. My degree in electrical engineering didn;t really do much on the mechanical side. Yes that's a good idea, I'll do one on transistor schematics.

They're just old deginations from way back when. Mught as well call the A, B and C for want of anything better. They are DC voltages.

Hi. The problem with that is that it varies from amp to amp, there is no standard tranlation. It's not usually too difficult to follow though. E.g. find V1, then find pin 2, ah... there's the 100k resistor which is on the schematic etc. The layout is usually fairly logical.

Hi Michael I have that schematic do you need it?

That amp is a monster. In my city there are two, 2x12" combo.

@@stuartukguitarampguy5830 Hello Stuart. I have that schematic. I actually printed it out on four letter sized pieces of paper and taped them together. I showed "Uncle Doug" how to set up the printer to accomplish that. It comes in handy for complicated schematics where you want a hard copy to make notes on.

@@miguelrichartmellado2834 Yes, 2 x 12 combo. Mine has the UTAH speakers with the large square magnets. Very heavy. I built a head cabinet for the chassis, and left the speakers in the original cabinet so it's easier to transport.

@@MichaelSmith-rn1qw Ok great. I usually just print off the bit I'm interested in. Tbh I rarely have to do even that.

Glad you enjoyed it. Yes the ground is the metal chassis and that's connected to the eartn wire in the plug, definitelty not neutral!

@@stuartukguitarampguy5830 Hi, thanks for your reply. Is it normal to have circuit that just dumps a massive amount of current to the ground as part of normal operation? The giant smoothing capacitors with the 400 volts rating in series, are acting like some sort of high pass filter right? The AC signal starts becoming like DC to feed the voltage of the power tubes but the high frequencies are constantly sent to ground. I suppose this is normal, but still somewhat surprising as sending signal to ground is normally we intuitively see happening as a safety mechanism when something shorts and connects a voltage source to the metal casing. Still too much of a ignorant in respect to electrical circuits, it's what it is.

@@ertreriHi It's a bit hard to explain in short reply. Maybe the mest way is to consider a battery connect to a lamp. So the positive goes to one side of the lamp and the negative to another. The amp lights. WHere is the current from the positive terminal (which goes through the lamp) being 'dumped' to? It's dumped to the negative side of the battery, right? Now if I happen to also want to connect that negative terminal to my metal case and also the mains ground, nothing changes. No current is being 'dumped' to ground in that case. It's the same with mains powered gear. That's the best I can do without a coirse in electrics! Keep studying and learning.

Glad you enjoyed it.

V1,2,3 are all 12AX7 (ECC83). LEave V3, that's the one nearest the power tubes and is the phase inverter. V1 is nearest the input jack. There's not a lot you can experiment with really. You won't hear any difference between valve makes. All you can do is reduce the gain but putting a 12AY7 in the V1 position. What are you trying to achieve?

@@stuartukguitarampguy5830 Thanks very much for replying Stuart, I was after exactly what you said, I have a HRDLX I got an amp tech to swop out the original Caps, I put a ecc81/12AT7 in V1 and changed the speaker for a TREX and bingo, sounds great i'm into SRV. I can find schematics for the fender but nothing decent for the valveking, so I wanted to know which was V1, you answered that and I am very greatfull, what do you think of the 12AT7 in V1 on the Peavey ?

@@ronnocm8633 I have the schematic for the VK if you want it. At the end of any video you'll see an end graphic with my email on it, contact me via that. I prefer an 12AY7 to the ECC81 if it's a gain reduction you are looking for.

@@stuartukguitarampguy5830 Theres a website cant see an email

Ho ho!

Hi Dan Yes I believe that is why they do it.

I think what you're seeing is the fact that when the guitar lead is UNPLUGGED, the hot contact is grounded. This is to stop the amp humming. When you plug in, this ground connection is broken.

@@stuartukguitarampguy5830 Thanks, that was most definitely not obvious. While a direct short to ground on the hot input during normal operation wouldn't necessarily damage the circuit, it's not a typical design choice for a couple of reasons: 1. **Potential for Ground Loops:** Even though the hot isn't connected to a power source until the guitar cable is plugged in, a direct short to ground on the input could create a ground loop if there are other grounding inconsistencies in the circuit. Ground loops can introduce unwanted hum or noise. 2. **Unexpected Behavior During Troubleshooting:** If a technician were troubleshooting the amp without a guitar plugged in, a direct short to ground on the hot could lead to unexpected behavior, making it more difficult to diagnose the actual problem. In a well-designed amp, grounding the sleeve of the input jack is the preferred method to minimize noise when no cable is plugged in. This avoids potential ground loops and unexpected behavior during troubleshooting. Would you agree?

Hi Jay What is the triple x?

@@stuartukguitarampguy5830 peavey amp.. my first real badass amp I got around 2001 and it just died... dont know why... not places around me that fixes them... had a guy looking at it... he does some stuff with amps... its got him stumped... I have another one, but thats my baby...