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Old 19th October 2004, 03:08 PM   #1
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Default Any mods for Carver Silver 7T?

I've got a pair of Silver 7Ts and would be interested in any upgrades/modifications that improve the sound quality.

TIA,

Brent
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Old 8th November 2005, 02:20 AM   #2
audio89 is offline audio89  United States
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Hi.. brentslone

I have a pair of the silver 9 t's, and i have some simple mods that do help. do you have a service manual?
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Old 8th December 2005, 07:08 PM   #3
JBJR is offline JBJR  United States
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I also have a pair of the 9t's and the service manual.

Whay mods do you have for this amp?

Thanks,
John
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Old 10th December 2005, 07:59 PM   #4
audio89 is offline audio89  United States
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Hi JBJR,

The mods really are just simple upgrades. Over time i noticed that my Silver 9ts didnt sound as open and warm as the day i bought them. So i called Sunfire/Carver service to maybe get them refurbished. At $400 each, and the fact that all they do is just replace the power supply caps and give it a once over.. i decided to do it my self.



So long story short, here is what i replaced.

Emitter resisters
R95/95
R96/93
R92/84
R97/53

Other resistors
R87/88
R43/42
R69/70
R86/90
R60

Transistors
Q6/5
Q9/10
Q21
the 2SC3281/2SA1302 are discontinued
So i replaced them with 2SC5200/2SA1943

Q28,11,29,17,18,30,31,19,32,20...2SC5200
Q36,37,24,25,33,12,35,23,34,22...2SA1943

The power supply caps i'm still looking into, need to find better quality caps to replace with....wich i'm open to suggestions from anyone.

Anyhow the difference was night and day, there very clean, detailed, open and warm now. I even think they sound better then they did new.

If you dont want to do all that work just simply replace the emitter resistors.
R95/95
R96/93
R92/84
R97/53

and that should make a big difference in the sound stage= open and warm.

I have another set of silver 9ts that i just replaced the emitter resistors and that alone made a big difference.

I plan on doing alot more and will keep you posted if you like. I also have a TFM55 that i'm playing with, did the same to it and noticed a big difference.

Where do you live JBJR? If your close to IL i'm willing to give you a hand.
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Old 10th December 2005, 08:54 PM   #5
anatech is offline anatech  Canada
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Hi audio89,
I remember there was a mod for a damping pot problem. It could cause your amp to "motorboat". I can't remember it exactly because I no longer have the manuals.

Swapping the outputs didn't help much, but if those resistors were overheated I could see why you did it. Did you bypass the rails?

New filter caps might be helpful. You should see if you can get them as a service part. The values are odd.

-Chris
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Old 11th December 2005, 07:00 PM   #6
audio89 is offline audio89  United States
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Hi Anatech,

The damping pot mod that you are speaking of is only for the silver 7t. For some reason the outputs on the lower voltage rail seem to be under more strain. I noticed in both my TFM55 and SS 9ts replacing the outputs make a big differance in the sound stage. I did price the replacement caps, $33 each from Sunfire.
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Old 11th December 2005, 07:10 PM   #7
anatech is offline anatech  Canada
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Hi audio89,
Okay, that makes some sense to me. Interesting that the new outputs made that much difference, but that can happen if you match them. I always do and have had comments like the one you just made.

The other transistors are only for commutation. Therefore they are not used as much, and they have the output transistors in series with them before the speaker. The only thing to watch is there is no glitching that will come through to the speakers.

You could use the old outputs in those locations if you need to repair one. I doubt strongly you would hear them.

$33.00 doesn't sound that bad. Filter caps used to be really badly overpriced, even at my cost.

-Chris
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Old 11th December 2005, 08:18 PM   #8
audio89 is offline audio89  United States
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Hi Anatech,

Yes i did match them, i think the reason they get stressed is the amount of current that can flow through them. the 2SC3281/2SA1302 has a cbo/ceo of 200v, so the rail voltage sits at 28v allowing for 7 amps rms per output. If you use the 2SC5200/2SA1943 at that voltage you get 8.2 amps rms per output. Correct me if i'm wrong, i'm still learning
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Old 11th December 2005, 08:26 PM   #9
anatech is offline anatech  Canada
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Hi audio89,
Matching the outputs and other transistors in the audio chain can make all the difference! I've seen this over many years consistantly as long as the base design is up to snuff.

If you are looking at the second breakdown figures, what you are saying makes sense. This only buys you some headroom. It will not change the behaviour of the device under normal operation. It will not hurt it either. The devices you used are newer and improved, so good. I think you would have seen the same improvement in sound with a matched set of the original numbers too. (I have)

BTW, we are all still learning. "I love this job" - Down Periscope

-Chris
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Old 12th December 2005, 06:40 PM   #10
JBJR is offline JBJR  United States
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Quote:
Originally posted by audio89
Hi JBJR,

The mods really are just simple upgrades. Over time i noticed that my Silver 9ts didnt sound as open and warm as the day i bought them. So i called Sunfire/Carver service to maybe get them refurbished. At $400 each, and the fact that all they do is just replace the power supply caps and give it a once over.. i decided to do it my self.



So long story short, here is what i replaced.

Emitter resisters
R95/95
R96/93
R92/84
R97/53

Other resistors
R87/88
R43/42
R69/70
R86/90
R60

Transistors
Q6/5
Q9/10
Q21
the 2SC3281/2SA1302 are discontinued
So i replaced them with 2SC5200/2SA1943

Q28,11,29,17,18,30,31,19,32,20...2SC5200
Q36,37,24,25,33,12,35,23,34,22...2SA1943

The power supply caps i'm still looking into, need to find better quality caps to replace with....wich i'm open to suggestions from anyone.

Anyhow the difference was night and day, there very clean, detailed, open and warm now. I even think they sound better then they did new.

If you dont want to do all that work just simply replace the emitter resistors.
R95/95
R96/93
R92/84
R97/53

and that should make a big difference in the sound stage= open and warm.

I have another set of silver 9ts that i just replaced the emitter resistors and that alone made a big difference.

I plan on doing alot more and will keep you posted if you like. I also have a TFM55 that i'm playing with, did the same to it and noticed a big difference.

Where do you live JBJR? If your close to IL i'm willing to give you a hand.
Hi Audio89,

I live in PA, a little to far to stop in for some help! I will look into doing this, I think I can handle it. What type of parts, make did you use for this. Yes I would really like to replace the power supply caps as well, but, need to find ones that will fit.


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