Please give me a review on mi DIY SS guitar amp - diyAudio
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Old 24th April 2009, 02:21 PM   #1
FPEREZ is offline FPEREZ  Mexico
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Join Date: Oct 2008
Default Please give me a review on mi DIY SS guitar amp

I builded a ss guitar amp whit a jfet preamp and two TDA7294 chips on bridge configuration.

The preamp its based on the ideas presented on runoffgroove and Ericks corner, i just take a look on some old tube amp schematics and adjusted some values to my personal taste.

Please let me know what do you think about it

Thanks

http://www.youtube.com/watch?v=KVB0ukhl-rY

The video its on spanish so just listen to the playing.
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Old 26th April 2009, 04:38 PM   #2
Minion is offline Minion  Canada
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Join Date: May 2006
Location: Cowican Bay , vancouver island
You got a schematic ?? It sounds nice if yer into that clean sound ...

I am building a Guitar amp right now useing 2 x TDA7293 with a tube/SS Hybrid preamp ....

Here is the preamp schematic ...

Click the image to open in full size.

Here is a Picture of my last Guitar head I built , a 100w Tube/SS Hybrid amp with a 15 band eq and DI and oth er stuff ....

Click the image to open in full size.


Cheers
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Old 26th April 2009, 04:58 PM   #3
AndrewT is offline AndrewT  Scotland
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why a pair of IC opamps sandwiching a tube stage?
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regards Andrew T.
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Old 27th April 2009, 12:54 AM   #4
Minion is offline Minion  Canada
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Because I like insane distortion , the Input opamp gives gain to totally overdrive the tube , the output opamp is a buffer that gives a low inpedance output to the Inverting Tone controll stage ... with the adjustable gain on the first stage and the level controll between the two triodes I can go from clean to insanely distorted .... The cathode of the tube stages aren"t bypassed so the gain isn"t as high as it might seem within the tube stage but I might experement with putting switchabe caps in the cathodes ...

Actually a lot of the design is based on a PAIA Kit I bought so I know the basic configuration should work ....


Cheers
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Old 27th April 2009, 10:35 AM   #5
AndrewT is offline AndrewT  Scotland
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Hi,
Surely "insane" is the wrong adjective to use.
If you and your listeners/customers like the sound your guitar produces then it's quite sane.

If however, they all leave as you turn up the pedals, then maybe that's insane.
That begs the question: who is insane? The listening public or the musician?
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Old 28th April 2009, 12:26 AM   #6
Minion is offline Minion  Canada
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Join Date: May 2006
Location: Cowican Bay , vancouver island
Wow Andrew , That is some pretty deep stuff , philosophy at its best .....

Actually with the 100w head in the picture does have some super heavey distortion tones , I usually play with they tube drive on 10 but the solid state overdrive (the first opamp) on about 3.5 and it is really heavey , any higher it just turns into a untameable beast , but it sounds freaking awesome....

Cheers
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