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 veryhotthread  Author  Topic: SLO Too Bright? Fizzy? PROBLEM SOLVED!!  (Read 10692 times)
Wolfgang von Bockenheim
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xx Re: SLO Too Bright? Fizzy? PROBLEM SOLVED!!
« Reply #15 on: May 10th, 2013, 5:08pm »

MHProd,

To me, that is a respectable point of view.

After all, before Mike Soldano started producing his own designs, he modified Marshalls and perhaps also other amps. Why would it be a sacrilege to modify a Soldano amp?

I'd like to own a Soldano-modified Marshall, too.
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MHProd
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xx Re: SLO Too Bright? Fizzy? PROBLEM SOLVED!!
« Reply #16 on: May 10th, 2013, 7:18pm »

Cheers Wolf!
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JRW
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xx Re: SLO Too Bright? Fizzy? PROBLEM SOLVED!!
« Reply #17 on: May 10th, 2013, 10:07pm »

Well I did say that I am open minded, and I sincerely do mean that. If at all possible, hearing a sample of the mod would be nice.
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gbsmusic
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xx Re: SLO Too Bright? Fizzy? PROBLEM SOLVED!!
« Reply #18 on: May 10th, 2013, 11:27pm »

The bottom line is you're happy with it now and that's all that matter's!! Congrats on that!
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xx Re: SLO Too Bright? Fizzy? PROBLEM SOLVED!!
« Reply #19 on: May 16th, 2013, 01:33am »

YOU MUST POST A CLIP!!!!!!

PS See guys, I'm not crazy.
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xx Re: SLO Too Bright? Fizzy? PROBLEM SOLVED!!
« Reply #20 on: May 16th, 2013, 5:14pm »

Nope, you're not crazy!

Unfortunately, I can not post a clip at this point.

I've been playing with my SLO for a while now and it sounds glorious!

After researching the issue a bit more, I'm wondering if the SLO doesn't suffer from crossover distortion. Many classic amps have this issue which can result in unwanted noise and exuberates what some of us perceive as too much brightness.

The cure for this has been a zener and a diode in series mounted in parallel to the grid resistors of the power tubes. I did that in another amp and it worked really well. However I feel the conjunctive filter takes care of this issue indirectly, maybe by masking it.
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xx Re: SLO Too Bright? Fizzy? PROBLEM SOLVED!!
« Reply #21 on: May 18th, 2013, 3:43pm »

MHProd; Is there anything about this mod that worries you? Are there any potential problems? I'm really interested in it, but I'm guessing that it voids the warranty and am wondering how safe it is. Thoughts? (for those of us that are technically challenged)
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xx Re: SLO Too Bright? Fizzy? PROBLEM SOLVED!!
« Reply #22 on: May 18th, 2013, 6:40pm »

on May 18th, 2013, 3:43pm, Heavision wrote:
MHProd; Is there anything about this mod that worries you? Are there any potential problems? I'm really interested in it, but I'm guessing that it voids the warranty and am wondering how safe it is. Thoughts? (for those of us that are technically challenged)


If it's done right, then no, it doesn't worry me. I have other amps with conjunctive filters and never had an issue. My friend's SLO has been like this ever since he got it 3 years ago and he plays with it quite often, no problems. This 'mod' has been around for decades, used in different kinds of audio amps and guitars (Dr Z amps use it on some models).
It's effect is very much like a low pass filter on a recording preamp.
There is nothing unsafe about this as long as whoever performs the mod is able to make 3 proper solder joints.

I have no idea about the warranty.
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xx Re: SLO Too Bright? Fizzy? PROBLEM SOLVED!!
« Reply #23 on: May 19th, 2013, 03:00am »

on May 18th, 2013, 3:43pm, Heavision wrote:
MHProd; Is there anything about this mod that worries you? Are there any potential problems? I'm really interested in it, but I'm guessing that it voids the warranty and am wondering how safe it is. Thoughts? (for those of us that are technically challenged)


Again, keeping an open mind, potential problems are always a factor but if I was to do it, I would probably step up to a 1600V-2000V rated cap and I would want Soldano to do it (if they would) just to keep the warranty in check and piece of mind down the road. Theoretically, it could wired in as a "mod" with a bypass switch I would think -- would probably have to switch between direct and "snubber" output mode before powering on the amp.
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xx Re: SLO Too Bright? Fizzy? PROBLEM SOLVED!!
« Reply #24 on: May 19th, 2013, 4:38pm »

Just played a big gig last night with my new band.......used my Ibanez Jem 77vbk into my stock SLO. Cab is an old ADA split stack with two eminence legend v12's. TC Gmajor II in the loop of the SLO. As always, the sound was glorious. Fetched many many compliments, including from both sound guys. For me, my stock SLO is not fizzy, buzzy, too bright at all. I get the master up to just over 3 or 4, and it is fat tone heaven. After 8 years of owning it, my SLO is still just everything I could ever dream of wanting from an amp. No mods for me.
« Last Edit: May 19th, 2013, 4:39pm by lynchfan6 » User IP Logged

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xx Re: SLO Too Bright? Fizzy? PROBLEM SOLVED!!
« Reply #25 on: May 20th, 2013, 10:04am »

MHProd,

Here's the deal. I talked with Bill Sundt about this mod in extreme detail last week. For those that don't know Bill, he is a genius in this field and Mike's right hand man at Soldano Seattle.

This mod is called a "snubber" circuit. It was developed in HiFi audio applications many years ago but some guys have chosen to adapt it with their guitar amplifiers. After an hour or so discussing this will Bill, he says there is no harm to the amp if done correctly, but he still believes that there is more to gain by changing speaker cabinets than this mod, tube changes, or bias changes.

Your ears are the final determining factor and if it works for you, rock it. Great thread, thanks for passing on.

LB
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James L. Burke III
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xx Re: SLO Too Bright? Fizzy? PROBLEM SOLVED!!
« Reply #26 on: May 21st, 2013, 01:21am »

Thanks Mr. Burke!

I am in the middle of a little experiment. I will post an update soon.

Cheers!
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xx Re: SLO Too Bright? Fizzy? PROBLEM SOLVED!!
« Reply #27 on: May 23rd, 2013, 01:51am »

Tried a few different sets of speakers and I'm very pleased with the results. See my updated first post for details.
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Giga
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xx Re: SLO Too Bright? Fizzy? PROBLEM SOLVED!!
« Reply #28 on: May 23rd, 2013, 03:40am »

I * think * V3 is the main responsible for the fizz. Try putting a lower gain tube in V3 and see what happens....

I'm not sure it's the cold clipper stage or the "normal"one though.

Giga
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xx Re: SLO Too Bright? Fizzy? PROBLEM SOLVED!!
« Reply #29 on: May 23rd, 2013, 04:09am »

on May 23rd, 2013, 03:40am, Giga wrote:
I * think * V3 is the main responsible for the fizz. Try putting a lower gain tube in V3 and see what happens....

I'm not sure it's the cold clipper stage or the "normal"one though.

Giga


No. V3 is the cathode follower for the loop's Send. V5 is the PI and putting a low gain tube there isn't particularly recommended.

I tried many preamp tubes combinations and it did not affect the issue at all. Not a preamp issue.
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