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2.3 watt x 4 or 5 watt x2 SET amplifier using DECWARE Zkit1 and Zkit4 schematics
2.3 watt x 4 or 5 watt x2 SET amplifier using DECWARE Zkit1 and Zkit4 schematics
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Old 24th October 2014, 07:56 PM   #1
Redwolf92 is offline Redwolf92  United States
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Default 2.3 watt x 4 or 5 watt x2 SET amplifier using DECWARE Zkit1 and Zkit4 schematics

Hello tube/valve geniuses,

I am I would say a novice in the area of tube amplifiers and am extremely interested in them as I built my own working DECWARE Zkit1 SET amp about a year ago. I love how it sounds on my marantz speaker setup and I recently series bridged it to mono and power my JBL L-100T cabinets with it, achieving shockingly good results for the little thing. This among other things started an idea in my head about making a larger set amp out of two of the Zkit1's so I could have 4, 2.3 watt channels or if I series bridged each side, 2, 5 watt channels. If my one Zkit1 could power both my JBl's to a great sounding conversation volume, then if I had this big amp with essentially a bridged Zkit1 going to each individual JBl cab I would have an amp to power them to nice loud awesome volumes. I then said to myself what the hell, while Im at it I want to add a phono pre-amp stage (Zkit4) so I can listen to my turntable in tube stereo awesomeness.

So far my idea will have me building an amp with two large power transformers, one smaller one for the pre-amp, and four nice big output transformers, which means $$$. I just wanted to post on here to maybe get some feedback on the thought, and to see if Im just being plain stupid or not. I would love to know any way of upgrading these amps and making them even better as well. I have drawn up my own schematics to show you all what is in my head, and I will post the DECWARE kit pages below. The kit pages have full parts lists for Mouser.

Zkit1 - Zen Triode SET kit amplifier model ZKIT1
Zkit4 - ZKIT4

Thanks for any input no matter good or bad!!
Attached Files
File Type: pdf Amp powersupply.pdf (304.4 KB, 77 views)
File Type: pdf Amp section.pdf (564.5 KB, 126 views)
File Type: pdf Pre-amp selector and powersupply.pdf (292.7 KB, 61 views)
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Old 25th October 2014, 01:34 AM   #2
azazello is offline azazello  Bulgaria
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When You use two "paralleled" inputs of amps for one channel, acc. Your schem, You will have the same output power, like from one amplifier.....
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Projects: SE GK71, SE 12BQ6, PP KT88, OTL-OCL 6AS7 Gen. Electric, SEs 2A3 RCA, 300B JJ, 6S4S, 4P1L, EL11 Telefunken, 6AS7 RCA, 6S33S, 6S41S, 6S19P, E84L Siemens, E236L Telefunken, headphone ampl. OTL Loftin White 6AS7 RCA,...
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Old 25th October 2014, 02:07 AM   #3
azazello is offline azazello  Bulgaria
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Image.....water from 1 pipe to 2 parallel pipes...water pressure in every pipe will be two time less.
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Projects: SE GK71, SE 12BQ6, PP KT88, OTL-OCL 6AS7 Gen. Electric, SEs 2A3 RCA, 300B JJ, 6S4S, 4P1L, EL11 Telefunken, 6AS7 RCA, 6S33S, 6S41S, 6S19P, E84L Siemens, E236L Telefunken, headphone ampl. OTL Loftin White 6AS7 RCA,...

Last edited by azazello; 25th October 2014 at 02:09 AM.
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Old 25th October 2014, 02:44 AM   #4
Redwolf92 is offline Redwolf92  United States
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That does make sense, I should have thought of that. What if the pre-amp stage is on the line in and then the two sides of the amp pull from the right out and left out of the pre- amp respectively? I dont know what to do for a phono input then, but would that work? Im open to any ideas, I just think it would make it easier to look nice using the Zkit circuit boards DECWARE has available. My first amp I didnt buy the board and tried point to point. I ended up with a rats nest of sorts, but it still works and is only a little bit noisy. Like I said if this is just a plain bad idea just tell me to drop it, but do you know of anything that might be like the concept?
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Old 25th October 2014, 07:46 PM   #5
costis_n is offline costis_n  Greece
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Just don't do it...

It is a waste of money to have all these $$$ transformers if you want to acheive just this simple thing. Just make a single ended amplifier with a more powerful tube like KT77, 6L6, KT88

Also transformers and tubes are not perfectly matched, when you bridge them it is not optimum.. Better have one amplifier per ooutput.

And, this Zen kit schematic is pretty horrible in my opinion. Lots of better schematics in here if you search.....
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Old 25th October 2014, 09:40 PM   #6
azazello is offline azazello  Bulgaria
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Better buy OT for 70-80 $ from Hammond 125 FSE or GSE and tubes like above and pretubes 12AT7, ECC88, 6SL7.....and You will have amp on good level.
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Projects: SE GK71, SE 12BQ6, PP KT88, OTL-OCL 6AS7 Gen. Electric, SEs 2A3 RCA, 300B JJ, 6S4S, 4P1L, EL11 Telefunken, 6AS7 RCA, 6S33S, 6S41S, 6S19P, E84L Siemens, E236L Telefunken, headphone ampl. OTL Loftin White 6AS7 RCA,...
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Old 25th October 2014, 10:23 PM   #7
Redwolf92 is offline Redwolf92  United States
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Ok so scratch the original bad idea. So what Ive gathered here so far is to look for a
design that uses KT77, 6L6, or KT88. The only one of those tubes Ive experinced so far is the 6L6, and that was in an old peavy guitar amp.

So my next question is which of those tubes will yield a better amp. I know "better" being relative, but is there a strongest one? Do the KT tubes have similar characteristics? Any of them have better bass response than the others?
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Old 25th October 2014, 10:39 PM   #8
costis_n is offline costis_n  Greece
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All KT's are different, they have rough equivalents in other output tubes

KT66=6L6
KT77=EL34=6CA7
KT88=6550

Of these, KT7/EL34 are easiest to drive, and KT88/6550 are the most powerful
You can find a lot of schematics for all of them in here and with google

Bass response is in the transformer and the circuit...
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Old 27th October 2014, 06:26 PM   #9
Redwolf92 is offline Redwolf92  United States
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Thanks for the information. So using the design here

DIY Single-Ended (SE) KT88 / 6L6 / EL34 / 6CA7 Tube Amplifier

and adding a switched 560 ohm cathode resistor will allow for me to use all the other tubes while still having the option to use the KT88 to its full potential? Then for the other channel I would just split off after the choke and copy the schematic.
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Old 28th October 2014, 02:05 AM   #10
sherpa is offline sherpa  United States
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Look at the Tubelab SSE, Depending on tube choice you could have anywhere from 3W to 14W power. I went with all Edcor transformers. The CSXE outpot transformers are spendy at 80 something each but cheaper than the equivalent Hammond and they sound INCREDIBLE. Running my SSE with KT88's right now and switchable from Triode to UL. Also can switch CFB in and out and select SS or Tube rectification. It's an easy build and the Forum here has plenty of help available. Check it out.
Paul
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