Tube Amp Archive

Thank you guys for all your help, I can understand this much better now.
And I can play with TSC now! I'm thinking about the following changes..
Deeper bass and more scooped mids



Thank you so much!

Thanks! Would you mind helping me out with the TSC plot? I know how to change the values, but I can't really identify the components (which resistor is which, what is R5 in the plot).

I'll try the 33K.

Thanks again!

I don't, unfortunately.

But thanks for the reply!

Hi, I was wondering if you guys would have suggestions to improve this tone stack: https://i.imgur.com/b1M3ElJ.jpg Here's a better look at the resistors (maybe I'm wrong about values): https://i.imgur.com/9bHtG4v.jpg The bass is OK (maybe a little weak, I use it at 10), mids and treble could be at a...

Helloooo the 12at7 was delivered today! I thought it would kill the gain, so I put it in v2 (left a 12ax7 electro harmonix in v1)... there is definitely more bottom end and just a little less gain, not much of a difference (still squealing at max gain and 50% master volume). So I changed the 12at7 t...

You guys should be proud of me (minus the "buying shitty amp" part), I did almost everything you've suggested: 1) Twisted the input transformer wires 2) replaced the microphonic cap 3) Ordered a 12AT7 (should be here by Thursday). 4) replaced shitty input wires by shielded one Still squealing :lol: ...

Phil_S wrote: ↑Sat Sep 18, 2021 2:07 pm

marquimsp wrote: ↑Sat Sep 18, 2021 1:50 am it isn't that thick, around 4mm total... can't find specs anywhere.

https://www.tecniforte.com.br/cabos-montados

Ah, those are "pre-assembled cables" (montados), not what I have here.

Thanks!

it is a ** construction, send pls those video to the constructor we will wait for the reply :lol: also transformers are mounted in the worst position .. you can try to reduce gain with other tube and that's it, not possible to do too much if you have 0 experience .. (i would cut gain at least 100% ...

yes, it was thick lol...
but I managed to install it, now the input cable is shielded.
Still squealing, though!

Phil_S wrote: ↑Fri Sep 17, 2021 9:46 pm Techniforte Mojopath? Low capacitance instrument cable? I guess that will work but not ideal because it has a large diameter. RG59U or RG58 are more typical for this purpose.

it isn't that thick, around 4mm total... can't find specs anywhere.

I think the op should start a new thread to get the topic back onto what his issue is! Maybe the mods will split the thread to restore this one to the OP. Call the other one "8W from a 5W tube." I'd like to see where it goes, though I don't think we'll be surprised in the end. Lol... I don't really...

The first thing I would do would be to use shielded wire to go from the input jack to the board. The shield should be grounded / connected only at the input jack. On the other end it should be Heat shrinked off. In the tight confines of the lunch box type Orange amps that I have kicked the gain up ...

I don't know much about electronics, but I totally agree, it's way too much gain... I'll try the ecc81! If it's not too much to ask, how do I check if the secondary is grounded, and where exactly do I add a grid stopper? lol... If you think it's way above my head it's ok, I'll just replace the tube...

bepone wrote: ↑Fri Sep 17, 2021 3:52 am and, from one El84 it is possible to get 5W not 8

Lol those lying bastards deserve to be out of business... Just kidding, 5W is loud enough!

i dont like design with this pcb. nobody is respecting any rules, like clearance for the start ? :? try to see if the secondary is grounded ,if isnt then would squeal.. if grounded is ok , then too.much gain with the layout can create oscillation, cure is to reduce gain between the stages, (change ...