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coco
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PostPosted: Sun Jul 24, 2005 2:43 pm 
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JM,

You are correct. Best of both worlds! Schematic is posted with changes highlighted in Red.

s2 transformers are used in my builds, preferred for the kits and DIY can use their own choice.

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s2
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PostPosted: Sun Jul 24, 2005 2:53 pm 
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The Normal channel is voiced like the trem channel on a stock 18 Watt but with a little more gain. The TMB channel is voiced for tighter bass (less mud) than the other TMB variants and it is also much quieter and less compressed until you really dig into it.

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Maccabee
 Post subject: Re: TMB sIII?
PostPosted: Sun Jul 24, 2005 8:49 pm 
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coco wrote:
littlejohn wrote:
That's the ticket...always felt like the normal side/channel of the TMB designs could use something.
Those are great clips, great job! Johnny M)


Well, just today, I went another step further. I put a second bypass resistor on a toggle switch so lbet can switch the TMB tone at will (Clean - Grit) . I'm hoping to get some demo clips of that so you can hear what it sounds like. I know he says he likes it so far. It might become standard if it sounds good enough.

As far as the normal channel goes. I really recommend the change from the standard 18W.com design. Just a reconfig with minor parts change.

The sIII is an improvement on a good design and it is proving to be like having a little plexi with extra grind (via the MV) on demand.


:lol: Clips sound Awesome guys! What a novel concept... a Clean-Grind Switch using a second Cathode Resistor on a Switch. 8) Great work!!! I'm going to be building my first 18 Watt shortly. Prolly a Standard Tremelo Model. Later on, I wanna try a "Normal Channel" from a completey different amp if I can get the sucker to sound right using just one Triode. :shock:

CR ><>

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coco
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PostPosted: Sun Jul 24, 2005 9:40 pm 
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CR, seems to me you do something like this on your amps. Am I right?

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Maccabee
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PostPosted: Sun Jul 24, 2005 11:25 pm 
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coco wrote:
CR, seems to me you do something like this on your amps. Am I right?


Stephen;

Yes, all of my amps have this feature. Called a Clean/mean Switch on the Bluesbuster and a Normal/Boost Switch on the Thunderbolts. Not really an original idea. Zaphod Phil, JoeB, and I Developed it for the P1X Ver2 at AX84 to give the amp more clean headroom.

CR ><>

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Paul G.
 Post subject: Excellent!!!
PostPosted: Mon Jul 25, 2005 9:48 am 
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Quite an improvement, hats off to you guys.

Didn't consider building an 18-watter before because they are pretty much one-trick-ponies. The addition of better clean tones and more useful (to a geezer) drive sounds may make me reconsider.

P.
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bitsandvolts
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PostPosted: Mon Jul 25, 2005 5:43 pm 
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I've been long debating whether to build an 18 or a 6v6 plexi...

I've been long leaning towards the 6v6 plexi...and building it with fixed bias and SS recto....pretty much going after the 1987/1959 tone.

The sIII or Tsunami builds make the 18 a more viable option for me as well....

Up until this week, I was convinced I was going to do the 6v6 plexi...now I'm friggin confused again.


Good thing I've got an unfinished Lightning and an unstarted treble booster to keep me busy until I make up my mind...
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s2
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PostPosted: Mon Jul 25, 2005 5:50 pm 
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One question comes to mind, Frank. How many friggin' EL84 based amps does one need?! Go for the 6V6!

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bitsandvolts
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PostPosted: Mon Jul 25, 2005 7:37 pm 
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s2 wrote:
One question comes to mind, Frank. How many friggin' EL84 based amps does one need?! Go for the 6V6!


You are very right!

That's something that's been nagging at me. After the 'taboo', I'll have the lightning...thats 2 el84 amps.

The 6v6 would be a welcome change...

Thanks for the vote-in, that helps a good deal!

-F
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s2
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PostPosted: Mon Jul 25, 2005 7:49 pm 
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That's exactly why I haven't built that "sports car" amp yet. I already have 4 EL84 amps (18 Watt trem head, 18 Watt TMB combo (Tsunami), Lightning, AC15). I'm sure it's cool and all, but I think I have enough EL84s in my life at the moment. I'm looking toward another round of Deluxes (tweedy and another one of my special black face brews).

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bitsandvolts
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PostPosted: Mon Jul 25, 2005 8:02 pm 
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Yeah, you know....ultimately, I want my 4th amp to be a clubman-35. I want an el34 amp in the stable too....

So you're right...also, given that I grew up on a whole assload of plexi driven tones....I think the 6v6 plexi, with it's fixed bias and ss recto will be a cool addition.
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coco
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PostPosted: Mon Jul 25, 2005 8:32 pm 
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Yeah, MarkHuss.com did a 6v6 plexi, and you can do a 6V6 Lightning/Spitfire. I guess if you don't have a deluxe, there's always one of those too.

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s2
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PostPosted: Thu Jul 28, 2005 9:57 pm 
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EVERYONE needs a Deluxe! Actually, everyone needs 2 of them. One from the tweed era and one from the BF era. One of my favorite amps takes the PI and power amp from the Deluxe Reverb and grafts the preamp from the Princeton Reverb on top of it. That is one sweet sounding amp for clean, dirty, and everything in between. Trust me on that one!

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MooreCowbelle
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PostPosted: Wed Aug 10, 2005 4:27 pm 
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I was looking at the Trinity sIII layout, and I have a couple of questions:

- What is the purpose of the 100K resistor to ground on the gain wiper?
- You reduced the volume pot to 500K. Why?
- What differences in the .022 and .0047 coupling caps (I suspect a
difference in frequency roll-off)
- When you moved the phase inverter board components, you also moved
the big filter cap. Any particular reason?
- The schematic indicates a star ground, but the layout shows a buss
ground. ???
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s2
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PostPosted: Wed Aug 10, 2005 4:34 pm 
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The 100K resistor is a bleeder to reduce gain. The 500K pot also dumps some gain. The .022uF coupling cap increases bass response. These are both good tweak points. A .0047uF yields tighter bass. This is part of a scheme to eliminate the need for -FB. No particular reason for moving the filter cap. I can't speak to the grounding--that is Stephen's preference. I use a star myself, but you know that already :)

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MooreCowbelle
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PostPosted: Wed Aug 10, 2005 5:13 pm 
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Hah! That last question was a loaded one, just to get you interested... :)

Was the amp that Ibet played through built with a buss or a star? MAN that sounds good. Any chassis pics? Amp porn?

Thanks for the explanations - "amateurs" like me need lots of help.
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coco
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PostPosted: Wed Aug 10, 2005 5:23 pm 
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MooreCowbelle wrote:
Hah! That last question was a loaded one, just to get you interested... :)

Was the amp that Ibet played through built with a buss or a star? MAN that sounds good. Any chassis pics? Amp porn?

Thanks for the explanations - "amateurs" like me need lots of help.


That amp had a ground buss bar, and two chassis grounding points, one for hi voltage by the transformer, one for preamp.

I'll post some pics later.

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coco
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PostPosted: Thu Aug 11, 2005 9:54 pm 
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MooreCowbelle wrote:
Was the amp that Ibet played through built with a buss or a star? MAN that sounds good. Any chassis pics? Amp porn?


Image

sIII NO. 2 COMBO CHASSIS



Image


sIII No. 2 BOARD VIEW



Image

sIII No. 2 OPTIONAL GAIN RESISTORS TIED TOGETHER
REMOVE ONE FOR MORE GAIN



Image

sIII No.2 COMBO OPEN BACK



Image

sIII No.2 COMBO BUILD

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MooreCowbelle
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PostPosted: Fri Aug 12, 2005 4:00 pm 
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coco (and everyone else involved) -- nice work!

A couple of questions:
- Any particular reason why the gain resistors are zip-tied together?
- The layout indicates linear pots for Mid and Treb, but the schematic specifies Log/Audio. Which is it?
- is that buss grounded on the right?
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coco
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PostPosted: Fri Aug 12, 2005 7:40 pm 
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A couple of questions:
- Any particular reason why the gain resistors are zip-tied together?
A. Only to elimainate any rattle. In this case, only if the customer chooses to leave them in. If one is removed (cut out), the gain drops


- The layout indicates linear pots for Mid and Treb, but the schematic specifies Log/Audio. Which is it?
A. Good catch! I missed that one. Linear for Mid and Treb.


- is that buss grounded on the right?
A. Yes.

I'll update the schematic. Thanks!

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