New DIYTube SET 6B4G Amplifier !

2nd harmonics for the masses

Postby jduffy » Mon Feb 26, 2007 4:20 pm

Wow, very nice! Very clean looking.

I'm working on a preamp now and an amp like that would certainly be the next "to do" on my list.

It really looks beautifully organized.

Congrats and then some. Yellow_Light_Colorz_PDT_12
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Postby TerrySmith » Tue Feb 27, 2007 8:14 am

Steve- I live about 3 miles north of "tail of the dragon". It's quite a road! :o

Ed- looks like we will be neighbors, next time you're down, shoot me an email and maybe we can visit. Yellow_Light_Colorz_PDT_11
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Postby WA4SWJ » Tue Feb 27, 2007 10:33 am

Shannon,

Nice work! Save a board for me. I've already ordered the output transformers. Once you have them let us all know.

Tom - nice looking job as usual.

I'm in Brussels right now and finally got into a hotel with Internet capability and saw the new amp!

Regards,
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Postby EWBrown » Tue Feb 27, 2007 11:30 am

I'll probably try a drive on Deal's Gap / tail of the dragon, thiis summer when I'm down there for a couple-three weeks. The other winding twisty road is US 64 between Hayesville and Brevard, some of that gets pretty "snaky", too.

I'll definitely go for one of the get*SET*go boards, myself...
Mulling whether to use the 6115HSs, a pair of MQ RH-60s or MQ TFA-204s... The MQs are pprogressively more costly (200/pair, 250/pair) and they have excellent reviews. "Magic Mike" does a great job with his ironworks.

/ed B in NH / NC
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Postby MarkC » Thu Mar 01, 2007 12:30 pm

Will any of the Hammond SE OPTS work witht the new board?
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Postby TomMcNally » Thu Mar 01, 2007 12:46 pm

The James transformers are certainly better quality than the small Hammonds, like the 125SE series, and not that much more money.
But, you can use any SE transformer with a 3.5K primary, I have some
Hammond 125E's at home, I should try them and see what it sounds like.
The James have incredible bass response.
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Postby MarkC » Thu Mar 01, 2007 3:50 pm

Thanks Tom....That's sort of what I was getting at. I have a pair of 125SEs that I'd like to use if possible and maybe save a few bucks. BTW, how do these compare with your Darling amps?
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Postby TomMcNally » Thu Mar 01, 2007 6:45 pm

I started building this breadboard version at 5:00 PM .... it's about 7:30 now ... get*set*go with Sovtek tubes, Hammond 125E's, DynaClone PA-774 with Ned's cool nickel plated covers ... it sounds pretty darn good, I'm only on the second song, I normally like to warm them up for an hour or two, but I would say the Hammonds sound nice, good bass.

My Darlings vs. get*set*go ... The Darlings don't have as deep and solid bass as the get*set*go, and the Darlings, being only 3/4 of a watt, run out of power, no so much on music, but if you watch a movie that has a sudden burst of loud music or effects, the Darlings will punch a hole, where the get*set*go can deal with it better. Let's face it, low power SET amps are really for good speakers in small spaces, not "home theater" ...

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Postby SteveH » Thu Mar 01, 2007 9:03 pm

Why did I just have a 'Johnny Five' flashback ?

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Postby MarkC » Thu Mar 01, 2007 9:12 pm

Tom...Thanks for posting that...Great info...I'll have to give 'em a try when they come out...
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Postby Shannon Parks » Fri Mar 02, 2007 6:53 am

Matt from Triode just emailed me details of a new 30W SE OPT they might be carrying: 1.25k primary rated @ 225mA with a 43% ultralinear tap. +/-1dB from 20hZ to 20kHz. Secondary has 4, 8, 16ohms. I'll test this along with the James outputs all at once - maybe even with the 6AV5s. ;)
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Postby Shannon Parks » Fri Mar 02, 2007 7:01 am

TerrySmith wrote:If you built a linestage with this board, leave out the output tube cathode circuits and connect jacks at the 6B4 grid connection?


This is <possible>. But I was thinking a linestage would probably use a 6SN7 and be tweaked a bit different than the 6B4G design with 6SL7. For example, right now that 6SL7 is rigged up for tons of gain, and we have the 6B4G with a 475k grid resistor. With a 6SN7 we'd focus more on a lower output impedance. Maybe even play with a 6BX7 and 6BL7.
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Postby TomMcNally » Fri Mar 02, 2007 8:46 am

separks wrote:Matt from Triode just emailed me details of a new 30W SE OPT they might be carrying: 1.25k primary rated @ 225mA with a 43% ultralinear tap. +/-1dB from 20hZ to 20kHz. Secondary has 4, 8, 16ohms. I'll test this along with the James outputs all at once - maybe even with the 6AV5s. ;)


1.25 K ??? Sounds like a big mama !
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Postby EWBrown » Mon Mar 05, 2007 6:31 am

Crikey!

That 1.25K 30W SE OPT will probably be at least as large and heavy as the Hammond 1627SE series... Given the primary Z and the current handling, sounds like a good candidate for 2-4) parallel tubes, or even 6C41C or 6C33Cs.


/ed B in NH
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Postby EWBrown » Mon Mar 05, 2007 7:25 am

For a linestage, a lower-mu 6SN7 would be a better choice (unless you really need the extra gain) , just re-calculate the cathode and plate resistors as needed. In that case, use one filament winding for the 6AX5, and the other (rectified, if desired) for the VA tube. Actually, a 6X5 can be used here, it has the same pinout, and a linestage doesn't need the extra current capability. Save a buck or two...

With a litle design creativity, a nice 2W SET monoblock could be fitted on the board, using a 6EM7 or 6DN7, and a little "poetic license". Shades of the "Original Sin", Bottlehead's first "SEX" amp of about ten years ago.

/ed B in NH
Last edited by EWBrown on Wed Mar 14, 2007 7:03 am, edited 1 time in total.
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