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andy67

Ampeg SVT-3pro

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Hi guys,

For all of you who know me a bit, Yamaha Attitudes and Ampeg SVT-3pro are my thing but not specialism :D

So, bought a new Ampeg SVT-3pro form Thomman a few weeks ago. When I unboxed it and set it up it was fine. However, it has sat unused for a further few weeks because I'm enjoying my Hotone Thunder Bass and my Burgera Veyron so much. I decided to set the Ampeg up and it sounds awful :( some mid mush and artifacts like distortion and or phasing is coming through quite clearly when playing notes, harmonics and worst offender chords.  I set master volume tube to full, eq on almost flat line and work lightly on the gain. This combination has always worked for me.

Never had this problem before with a 3 pro so, did the usual, opened the hood, ensured the valves were sitting properly and checked to see they were heating up properly. All seemed ok on that level but tone remained same.

It is a Chinese Ampeg - please forgive me - I know they have issues but surely not as bad as this for a pro amp? All advice, help, hints, tips welcome :D

Stay safe and well folks,

Andy

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The only thing I can think of is you've got a bad valve, but not really sure what could be wrong. I hope you're still in Thomanns return window. This probably won't help, but here is how I used to set up my SVT3PRO. All buttons out and the graphic off.

image.thumb.jpeg.6f5a7b4816b51c30739fb612d40c0342.jpeg

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I might still be in the window, have emailed them now. 

Cheers fro the tip will check it out now :D

 

Made it worse but definitely got more microphonic sounds now! Getting there. :D

 

Andy

Edited by andy67

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The bias is known to drift on these.  Theres a tiny trim pot inside (to the right of the back two valves as you look at it from the front). Its EXTREMELY senstive tho so unless you have a very steady hand drop it in to a pro.  You need to measure along one of the 6 resistors next to it.  There is a youtube vid explaining far better than i can but the 3pro is known for this drifting issue

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I did my old USA one a while back, when i say sensitive i mean it, barely a slightest of turns makes a huge difference. I turned mine what seemed like a hairs width and it was almost too much.  That vid is a very good guide though 

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Lost output last night so, off it went back to Thomann today. 
 

Bias was set at 33.1mv got it to bang on 25mv, worked a treat, turned it off and back on again - no sound. 

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