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My [actually my son Andrew's] sIII V6 is working and stablized. lbet came over to test drive it for a few hours today.

The sounds is very smooth and sweet with a great bottom end.
Not as much high frequency energy or crispness as the EL84s.
Great sustain.

Great Blues sounds, even Jazzy but it does Rock & Roll well.
When you flip on the boost, you're moving into Deluxe country.

We found the sound levels balanced as well. The volume about the same between the 84s and the V6s.

I'll give it to lbet for a good long taste test starting Monday and we'll see if we need any further mods.

In the end, I made the tubes switchable.
If you want V6 power, you ignite them with a toggle switch and that
removes the cathode to the EL84s and turns on the V6s.

When you do switch, and you can with the amp running, there is a minor click as the other pair of tubes kicks in. Very manageable.

I installed all of this in the new, modded chassis and it fit nicely (see pics).



I left the LTP at 56K . I did try another 56K in parallel to the LTP
so it was close to 25K. but we did a lot of listening and felt there was not much to be gained for the extra complexity so I removed it. At least for
now. See how it goes.

I stuck with simplicity and added another switchable 120 ohm cathode resistor in series with the 120 ohm one for the EL84s. This
means the cathode bypass cap only is working on 120 ohm cathode
resistor.
Can't see anything wrongwith that.

Used 1.5K grid resistors to the 6V6s

Used NOS Sylyania 6V6s

Rest is stock sIII

Oh yeah, and I put a boost switch in while lbet was testing a customer's new 18W combo.


sIII V6

Changes from stock sIII in Red.




Pic showing wiring around the V6, cathode pair and EL84.





Pic showing wiring of the DPDT V6 switch.





Pic showing V6 switch from rear of amp.




Boost Mod

Pic showing sIII Boost Mod. Same value bypass cap as a Trainwreck!



Pic showing boost switch from rear of amp.

_________________
Stephen
Web: www.trinityamps.com. Facebook: facebook.com/trinityamps. Twitter: @trinityamps

Tubes used on sIII V6 - JJ and NOS Sylvania 6V6




The whole enchilada - rear panel removed. Now that's a lot of tubes!




Looks like an sIII - Right??




Not Quite! Check out the two extra switches - One for V6 POWER, and another for BOOST. Switches down = Stock sIII.

_________________
Stephen
Web: www.trinityamps.com. Facebook: facebook.com/trinityamps. Twitter: @trinityamps

Very clean installation. I like it!

Thanks, not bad I guess for a first try, protoype. It's already gone out on loan!

Did you ever try the 8K OT taps on yours? We found there was pretty good vol balance between the 84s and V6s.

_________________
Stephen
Web: www.trinityamps.com. Facebook: facebook.com/trinityamps. Twitter: @trinityamps

Stephen,
I no longer have a problem with the volume now that I have changed out that shorted power tube. I have also eliminated the PI resistor change, it added noise when switching. Its funny that you mentioned the boost switch, I also installed a footswitch type switch to add gain to the TMB channel by bypassing R9 with a 47uf cap as you suggest in your manual. I installed it in the chassis between V2 & V3. What does your boost switch do, I can't tell by the photo. I'll send you a photo of my completed mods.

Yeah, didn't find the PI change made significant difference. Which OT taps are you using BTW?

Do you like the V6?





Let's talk about it at:

viewtopic.php?p=5618#5618

_________________
Stephen
Web: www.trinityamps.com. Facebook: facebook.com/trinityamps. Twitter: @trinityamps

I'm using the 5K tap. And yes I like the 6V6's. I now have a cleaner channel. Also, its my first experiance with anything other then EL84's.

Stephen, any chance that this will be an option on the sIII kits?
I would be very interested, especially if it's available say after the first of the year

Yes, it could be an option soon. We still want to do more listening and any necessary tweaking to make sure it's what we want.

Probably 2 options. 1) additional 6V6 or 2) 6V6s instead of EL84s.

What would people think? Option 1 or 2?

I'll keep y'all posted.

_________________
Stephen
Web: www.trinityamps.com. Facebook: facebook.com/trinityamps. Twitter: @trinityamps

OF course they'd want option 1 AND 2!

_________________
Richard Johnson
-------------------
Playing an insturment doesn't make you a musician, listening does

Stephen, I'd like the option with both sets of tubes, however, cost is a consideration. Keep us posted with some sounds from Ibet.
Jim

Either or and both

I'm interested in the option with both sets of tubes in, just like the pictures in this thread.

By the way Stephen, thanks, I was sort of bummed that I need to wait until after the first of the year for my next kit, now it will be all worthwhile if this will be an available option by then.

Could be done tomorrow if you wanted but I think we should get some more listening in first.

Made a few more changes last night - V6 have their own cathode pair now.

Over to lbet tonight...

Looks like BOTH is the choice so far.

_________________
Stephen
Web: www.trinityamps.com. Facebook: facebook.com/trinityamps. Twitter: @trinityamps

Thanks for the offer, but I still have to wait til after the first.

I have an R8 on order from my local Gibby dealer, who may not be able to keep the distributorship for next year due to Gibby's revised requirements, so I had to order now.

Besides, I can wait to make sure you have all the bells and whistles set for the SIIIDT (dual tube). Looking forward to it!

The v6 is in the hands of lbet for now. I dropped it off tonight for extended taste testing. It sounded good to me! Sweet & Meaty.

_________________
Stephen
Web: www.trinityamps.com. Facebook: facebook.com/trinityamps. Twitter: @trinityamps

Coco,
I'll take mine with 36 watt trannies , half power , either 6v6's or El84's or all combined. Oh and a EF86 channel from a DC30 on the tone only channel, and since you'll have an extra triode in the TMB, make it switchable parallel in the first stage.

Actually, I've been studying those exact possibilities this morning when I ran back across this post. Any suggestions?


LeeMo

Sounds like it could be a killer amp LeeMo. I know there is a hi gain sIII in the works and a EF86 both by two different members.

We'll need to combine them! That extra triode could be a the hi gain option.

So you're talking about mixing the two v6 & 84 . Could be good.

Don't hold your breath for one tho.

_________________
Stephen
Web: www.trinityamps.com. Facebook: facebook.com/trinityamps. Twitter: @trinityamps

I have a scematic for the power section of an amp called "Black and Tan" . The inputs to the power section PI are EF86 and 12ax7. It has a pair of 6v6's and a pair of EL84's sharing the duties in push pull. I have no idea where I came across it.
I can't post it , so I'll E-mail it to you.

LeeMo

http://www.alessandro-products.com/amp-black.shtml this is the only one I can find but it does not have both sets of tubes just one at a time. Unless it is a later version.
Nigel