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Messages - lighthunt

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Schematics and Layouts / Re: Ibanez TSA30 Schematic and PCB Layout
« on: June 29, 2020, 12:30:16 AM »
The more someone tells me don't do that, the more I want to try. Or at least experiment to find out they are right ;-) So disappointed  :o

No, but seriously, thanks!! for the insight, the more I look at that your answer, the more I see it replies to my original question. If I do some experiments sometimes later, I will share here.

Cheers

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Schematics and Layouts / Re: Ibanez TSA30 Schematic and PCB Layout
« on: June 22, 2020, 06:57:56 AM »
Hi Phill, thanks for response!

> "The circuit already has a loop."
yeah, but it's between the tubescreamer and tube preamp. so pedals work well if I keep tube preamp clean or almost, but not great dirty (for reverb etc).

the SS frontend is the tubescreamer, nothing wrong with it and can by bypassed by pluging guitar into this fake FX loop return if you don't like it (well almost, I think there is still a clean buffer before tube, no truebypass switch).

To my ears, sound is great, lot's of tonal possibilities, just missing that real FX loop between preamp and power stage. not good for live playing if you want to switch between clean and (amp) tube distortion, cause you can never get the volume right for both it's one channel combo with swichable TS in the front. With real FX (between preamp and power) I would be able to control volume by pedal for both clean and dirty amp or proper reverb for both.

If I find time, I'd do the poor mans FX loop (https://robrobinette.com/Generic_Tube_Amp_Mods.htm#FX_Loop), should be easy mod since there is shielded cable leading to volume pot ...

Will report here later.

Cheers






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Schematics and Layouts / Ibanez TSA-30 REAL FX LOOP
« on: June 10, 2020, 02:19:12 AM »
First of all, thanks for the schematics! ;-)

Gentlemen, did anyone tried to mod/add real FX loop to tsa-30? IMO it's the biggest weakness of this amp from player point of view. (I'd like to gently overdrive the signal with TS  and push the tube with higher volume/gain to get sound I like, which works well on it's own but adding reverb in the front or into the "fake fx loop" ruins it).

So I am considering to add fx loop in between second preamp tube (V2) and the main volume pot. This should be easy mod since there is shielded cable already, but ... will such simplistic/passive approach work well or do I need to add any buffer there (transistor or opamp)?  I've studied other amp schematics (e.g Peavey classic 30) and they have transistor on the return. Is it necessary? Why? (impedance matching or so ... ,??)

I have some, but still limited knowledge, so I really appreciate your recommendation. Thanks!!!

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