My friend feel very upset of New Ampeg SVT VR

[rafe]

replacing those caps will most likely void his warranty (if he has one) from what I understand ...Ampegs have a great warranty.....so even though it only costs him 100 dollars ...if a tranny goes or anything else he's on his own .....

[sluckey]

I don't know who made them but they look cheap. I bet they don't sound very good.

I'm concerned about that brown one.

[kwm488]

Ampeg may offer very good warranty in USA. But it is another story in hong kong.

And I see this photo in Hk forum. But I don't sure this caps is fake or real.

[kwm488]

The blue caps is very cheap . I will use wima if I use this size caps. But I decide to use mustard to replace it.

As the brown cap , it is $0.3 usd for one here. I will use wima to replace it.

Or other suggestion?

[mresistor]

do you know what brand of blue color cap?

The blue cap is an MMY cap , says so right on it. Metalized Polyester film. Made by Yuchang Electronics Co. Ltd.

http://www.yuchangelec.com/fskr_mmy10.htm

[kwm488]

Thank you for your information.

Btw, is it good?

And I use wima all the way if I need small size mpf.

I see ampeg use wima in few year ago amp. But it seem to use more cheap caps in this year amp

[drgonzonm]

The mmy caps are made by yu chang electronics co a Korean Company

I did a search mmy capacitor

[PRR]

저희 유창전자공업(주)는 앞으로도 고객 여러분의 성원에 보답하고자 늘 제품품질 향상과 고객의 만족을 위해 전직원이 일심으로 단결하여 앞으로도 더욱 존경받는 회사, 사회에 기여하는 회사로 만들어 가도록 노력하겠습니다.

"...try to contribute to society as a company."

Not a "cheap chinese company".

[kwm488]

hi

i try to remove the the blue caps and change it to mustard.
but the result is not good. sound too hard, the bass is over, sound is overdrive little bit.
but i really don't understand why. because mustard caps good quality than that blue caps.
and vintage old SVT is also use the philips yellow caps.

and even i change the 3 preamp tube which for power tube section. this happen also, sound too hard, bass too much. i can't believe RCA tube bad than sovtek.
now, i guess will the problem come from the bias. because this amp have two bias led , but just one led is flash during playing

please advice me, in my guitar amp experience. good cap will not sound bad than bad cap. just different taste .

and i upload this parts schematic also. is the cap for the bias?

[sluckey]

IF YOU DON'T KNOW WHAT YOU'RE DOING, KEEP YOUR HANDS OFF!

[kwm488]

My purpose is change all cheap cap to good cap. But sound will never worse after upgrade. Why?

[sluckey]

IF YOU DON'T KNOW WHAT YOU'RE DOING, KEEP YOUR HANDS OFF!

[woolly]

looks like the sozo is in the wrong place?

[kwm488]

And I plan to use wima to try again.

But it is strange, even retune with RCA, sound strange too. But I don't think RCA bad than sovtek

[kwm488]

I change the mustard caps to wima black box . It sound back to normal. Wima and blue cap are mmp also. But the black box is the hifi grade cap.

And I change three 100uf samyoung cap to BC caps. Sound more punch , treble more better, sound more power

[fdesalvo]

Sweet mercy, man.  You guys should've just returned the amp after cracking her open.  That is a HUGE amount of money to spend and the fact that you are essentially in the process of gutting this amp is crazy.  Whoever suggested starting with the speakers was not trying to mislead you; you will end up spending so much money on marginal gains that won't even be noticed in a band setting, my friend.  Speakers will give you the best bang for the buck.  Take the head with you and go cabinet shopping.

[kwm488]

hi

i understand speaker is very important. my friend will make his own cab and buy weber 10FL bass speaker.

anyways, he want to change the caps first. it is cost $100 totally for all caps.

follow are philips caps, will install on friday, i will take a videos about before and after

[kwm488]

i install all BC cap to my friend SVT VR today. it sound better definitely. sound more fat, more detail, more power , more punch, more layer , smooth the treble and mid. i believe good filter cap can give the amp enough power.

i higher recommend to change the bad filter cap to better brand filter cap.

[kwm488]

My friend say sorry, he play bass not very good.

this is the video before mod



this is the video after mod

[jim]

I can hear the change and I like it.  You did your friend a great favor.  This is a vintage amp forum and many of us do not enjoy working on cheaply manufactured factory circuit boards.  You need to have a steady hand and nerves of steel to do this work.  Thanks for sharing the project with us.  Jim

[bakerlite]

sounds better allright - i bet you notice the change even more when you play using your fingers  though?

[bigsbybender]

When I first saw this thread, I was skeptical that there would be a noticeable improvement in tone with the component changes. I'm happy that I was proven wrong. It certainly sounds like there is more bass with a rounder tone. What a great deal of work you put into this amp!


j.