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Author Topic: Ibanez TSA30 Schematic and PCB Layout  (Read 4740 times)

Gustaf

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Ibanez TSA30 Schematic and PCB Layout
« on: May 06, 2016, 03:31:52 PM »

Here is the circuit diagram and PCB layout for Ibanez Tube Screamer Amplifier TSA30.

Thanks to vitrolin for sharing!

BR,

Gustaf
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bajaman

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Re: Ibanez TSA30 Schematic and PCB Layout
« Reply #1 on: September 09, 2016, 03:13:38 AM »

Thanks - extremely helpful - these amplifiers have been a curse to fix from day one - I have seen many with the same intermittent buzzing fault - almost pulled what is left of my hair trying to fix the suckers. The fault is capacitor C20, a 470uf 25v filter capacitor - I replaced this with a 2200uf 25v type - problem fixed ! Hope this helps anyone else out there :)
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phatt

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Re: Ibanez TSA30 Schematic and PCB Layout
« Reply #2 on: September 09, 2016, 08:00:04 AM »

Thanks Bajaman, handy to know little details like that. :tu:
I wonder why they run the preamp heater filaments at 10 volts ???
Phil.
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J M Fahey

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Re: Ibanez TSA30 Schematic and PCB Layout
« Reply #3 on: September 10, 2016, 11:46:45 AM »

I also wondered that the first time I saw it.
Not sure whether calling this weird or plain stupid.

They use a single regulator, here shown as a 10V one, to power both filaments, which require 12V (in fact, 12.6) and the Tube Screamer, which requires 9V .
So somebody finds himself very intelligent because he "split the difference" and saved one regulator  :loco, using a single 7810 instead of one 7812 (which to be perfect requires a diode to ground at the grund leg so it outputs 12.6V) PLUS a 7809 for the TS.
Maybe they gave him a bonus for the incredible savings  :duh

Personally I´d use a 7812, and increase the value of the resistor feeding the TS (R46) from 220r to about 1k2, which should give it poorly regulated 9V , more like a 9V battery would do.
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phatt

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Re: Ibanez TSA30 Schematic and PCB Layout
« Reply #4 on: September 10, 2016, 11:50:57 PM »

Thanks for the detail,,Yes I guess it's no surprise as everyone is trying to scratch out every last cent.
I figured it would run fine just by changing the reg to 12Volt and the TS circuit would sound much the same.
Phil.
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Mprall00

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Re: Ibanez TSA30 Schematic and PCB Layout
« Reply #5 on: October 12, 2018, 04:14:47 PM »

Reviving because I need to know - did anyone swap the regulator without changing r46? Haven’t verified everything in the path is rated over 12.6v so thought i would check if anyone already did it. If so, did it change the sound?
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phatt

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Re: Ibanez TSA30 Schematic and PCB Layout
« Reply #6 on: October 13, 2018, 08:49:58 AM »

I don't have that Amp but a read of the schematic tells me it will matter little as 12 volts is still within the 16 Volt cap ratings.
I doubt you would hear any difference in the sonic result.
Though V1 will last longer if heater is running 12Volts :tu:
Phil.
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Mprall00

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Re: Ibanez TSA30 Schematic and PCB Layout
« Reply #7 on: October 16, 2018, 01:58:18 AM »

I don't have that Amp but a read of the schematic tells me it will matter little as 12 volts is still within the 16 Volt cap ratings.
I doubt you would hear any difference in the sonic result.
Though V1 will last longer if heater is running 12Volts :tu:
Phil.

Thanks! Along with making v1 last longer, might it reduce the hiss? It adds white noise as I turn up the volume currently.  It seems to be coming from v1 as it disappears when I pull v1. I replaced the coupling caps and grid and plate resistors with metal film 1 watt resistors. Decreased the grid to 10k while I was at it. Reduced the hiss some but still not as quite as my tsa15... that amp has proper power to the preamp so wondering if it would help with noise too...?
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phatt

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Re: Ibanez TSA30 Schematic and PCB Layout
« Reply #8 on: October 16, 2018, 08:31:37 AM »

No way to really know without an A/B test circuit. :-\
But I'm guessing that with the Valve preamp section running wide open and then gain at 1C3A you are bound to have some hiss.

You can always reduce R4 and 5 too a more sane 100k that will reduce some excess hiss but be aware that U3A is active even when the TS part is switched out.
As far as the Valve section goes it's a Marshall/Bassman type circuit but volume is after tone stack which means the preamp is full on all the time so hiss will be evident even at lower setting of volume.
R17 could be made as a pot for preamp gain, that might have worked better.

Sorry I can't think of anything else,
Phil.
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Mprall00

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Re: Ibanez TSA30 Schematic and PCB Layout
« Reply #9 on: October 16, 2018, 02:13:24 PM »

No way to really know without an A/B test circuit. :-\
But I'm guessing that with the Valve preamp section running wide open and then gain at 1C3A you are bound to have some hiss.

You can always reduce R4 and 5 too a more sane 100k that will reduce some excess hiss but be aware that U3A is active even when the TS part is switched out.
As far as the Valve section goes it's a Marshall/Bassman type circuit but volume is after tone stack which means the preamp is full on all the time so hiss will be evident even at lower setting of volume.
R17 could be made as a pot for preamp gain, that might have worked better.

Sorry I can't think of anything else,
Phil.

Awesome. Thanks for the advice!
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g1

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Re: Ibanez TSA30 Schematic and PCB Layout
« Reply #10 on: October 17, 2018, 11:38:16 AM »

Once I worked on a tube mic that had a higher noise floor because the heater voltage was too high.  Bringing the heater back down to 12.6V had a noticeable impact.
Try it and find out, it's probably something that varies from case to case as far as how much difference it makes.
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