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Diameter and height. It will narrow down who I bug for a transformer. Because certain people only deal with certain core sizes.

If you use a transformer that is below the wall voltage (115V transformer on 120V wall voltage) it will heat up proportionally (like 125F instead of it normally running at 90F. That is why I choose 120V and 125V transformers for new builds. But you still haven't measured the Marshall...

Thanks. Your opinion is your own just like mine. Which are valid. Btw, I produce many different formats of music. Your highs analogy makes me think of the the Fletcher Munson curves you have to balance the mix to compliment in a recording.

no, I find that this mic is another 'bad audio purchase' like a lot of midstream things shoved into musician faces and priced higher than it should be. But let us not forget the rack gear either like the 1176 or the la2a that cost way more than they are actually worth. Because there is nothing...

The 58 just has too much of the wrong highs and not enough of the right ones. 8K I notice is really problematic with them and feedback. The wireless ones seem not prone to this, but they could be doing some sort of processing and gain structure set points that wouldn't exist with a plain 58...

it is a small oversight, that in some cases they would be over voltage. That is why they don't make it anymore. Since their European model is 230V and they use 220 power Then the B+ would be less than what was intentionally built. But even then, they are running the el84 tubes way out of their...

They are still called secondaries regardless of core type. A transformer w/o secondaries is called an auto-transformer regardless of core type. Torroids run cooler (normally if sized correctly and the primary voltage is not greater than the listed voltage for the coil) than EI types normally...

BTW, I have that ecc83 dude on ignore. But that is interesting that your amps you pick has toroids. Was that deliberate? Torroids can be efficient when chosen and installed correctly. The drawback to them is they can operate hot if they are not spaced off the chassis correctly. But there is...

I find them nostalgic. But I do find it interesting that the text books I learned tube theory in college long ago are even harder to find. But this was one of those classroom text books: http://www.tubebooks.org/books/peters_theory.pdf Of course people would freak out if I broke out in a...

I find this a hive mind mentality than anything. Especially when I let an artist taste test different mics on stage and most notice how much of a POS they truly are, so most end up with something not a SM58 by their choice.

No problem. Curiosity is a flavor of life. Without going through the formula for calculating that resistor, that is most likely not in those books in the link above, It would be a small value on a triode to begin with. So they save about $5 a unit not adding a 300-500 ohm resistor there. If...

I see how very helpful they were. So, it looks like this is going to be another backwards engineer so that a correct transformer could be used. Must have been a marketing thing to build something like this in a 1U rack, because any tube engineer in their right mind would never use such a small...

Oh so this is a particularity. If you have the transformer specifications, I might be able to find one or even get someone like Hammond to add it into their inventory. There might be one by someone who builds it for a 6bq5 stereo amp somewhere.

Don't bash yourself in the head over it. Unless you have dealt with the particularities of these devices for years you wouldn't know some of the back shop practices. I've been a tech for many years in a lot of different sectors and there is always learning curves and practices. When I served in...

I can relate to that as I try different mics on someone when I record them. When I do live sound, most of the time I have to settle with what the PA guy sat out. But on my personal PA, I use sennhieser mics because they work well in the untreated spaces I end up setting it up.

I pulled up the wrong schematic to look at the first time. Sorry about that. The transformer in this unit, you change out. According to Marshall, the part number is 64591A. But since it doesn't show up on searches its a custom wound transformer that you have to contact Marshall to get it.

After looking at the schematics, yes, its caused by the grid stop resistor not being there.

Without giving amp examples, it would be because the grid for the tube afterwards don't have what is called the grid stop resistor. So what happens is the grid element, which is a wire loop wrapped around a support frame inside turns into an electromagnet that attracts the heater emissions from...

I would have to define in in this context to keep this concise, but a well trained technician in a repair shop environment would always check bias after installing tubes. Even if they were the ones that suppose to be the correct ones accordingly to the manufacturer to use. Because even though...

no, I used Falstad circuit simulator to quickly draw the schematic, then I just screen captured a section of that window.