Looking for a new diy project

cgraf · 11th March 2011, 07:56 AM

Hi
As we soon move to a new house, it is time for a new tube amplifier!

I am looking for a really nice sounding push pull design, using el84 or also kt 88 tubes (as I like them). Initially I wanted to do a Single ended KT88 project, but yesterday night a colleague who is an audio professional convinced me to build a push pull amp.
I do not need a lot of power, actually I have an 8W tube amp which works fine, but I would like something around 15-20W to drive some less efficient speakers.

What I am looking for is a working schematics for a really nice sounding amplifier (other call it "high end").

Can anybody help me ? (I looked a lot into SE designs lately but am kind of lost of finding "the" schematics for a nice push pull amp.

Best regards

Christoph

Helmuth · 08:20 AM

http://www.triodedick.com/monobill_deel_1.htm

kt88 pp transformerset AE.
Automatic Electric Europe

Doz · 11th March 2011, 09:19 AM

Quote:

Originally Posted by Helmuth

MonoBill deel 1

kt88 pp transformerset AE.
Automatic Electric Europe

I built one of these, slightly lower HT,GZ34 rectifier, 6550's and a 6n1p driver with LED CCS. Works nicely.

Helmuth · 11th March 2011, 09:30 AM

measurements.
frequency response without feedback.

thd

Helmuth · 10:07 AM

AE does supply transformer-sets for triode dick designs.
http://www.ae-europe.nl/voedingstrafo_engels.htm
the kt88 set.

KT88 PP
4 x tube Electro Harmonix KT88
2 x output transformer
2 x choke 10H 200mA
1 x power supply
€ 436

Helmuth · 10:25 AM

Welter highend UL output transformer PP-el84=Welter Ü 284 25Hz-58kHz -3dB price 70euro.

Welter Audio Electronic**************************************** ******************************** Seit 1975

Or low cost Welter U3= 40euro PP el84
Welter Audio Electronic**************************************** ******************************** Seit 1975

Doz · 11th March 2011, 11:29 AM

With both the above schematics, it would be wise to add 470K or so from the grid of the input to earth...

mastodon · 11th March 2011, 05:26 PM

Quote:

Originally Posted by Doz

With both the above schematics, it would be wise to add 470K or so from the grid of the input to earth...

Really? The 'Bill' design relies on fixed negative bias, marked 'nrs' in the design.

Helmuth · 11th March 2011, 05:55 PM

Oeps mistake.

transformerset monobill. MonoBill
Electroharmonics kt88 and JJ ecc99.

Inclusief 4 x EH KT88 en 2 x JJ ECC99
€ 603,-

Helmuth · 06:34 PM

Quote:

Originally Posted by Helmuth

Welter highend UL output transformer PP-el84=Welter Ü 284 25Hz-58kHz -3dB price 70euro.

Welter Audio Electronic**************************************** ******************************** Seit 1975

Or low cost Welter U3= 40euro PP el84
Welter Audio Electronic**************************************** ******************************** Seit 1975

Mains transformer two channel PP. Welter N3/4 price 54 euro.

german qaulity great prices. Need to buy the covers separate.
Welter Audio Electronic**************************************** ******************************** Seit 1975

Highend version

HE-NT-PSE84 price 70 euro

11th March 2011, 07:56 AM	#1
cgraf diyAudio Member Join Date: Jan 2011	Looking for a new diy project Hi As we soon move to a new house, it is time for a new tube amplifier! I am looking for a really nice sounding push pull design, using el84 or also kt 88 tubes (as I like them). Initially I wanted to do a Single ended KT88 project, but yesterday night a colleague who is an audio professional convinced me to build a push pull amp. I do not need a lot of power, actually I have an 8W tube amp which works fine, but I would like something around 15-20W to drive some less efficient speakers. What I am looking for is a working schematics for a really nice sounding amplifier (other call it "high end"). Can anybody help me ? (I looked a lot into SE designs lately but am kind of lost of finding "the" schematics for a nice push pull amp. Best regards Christoph

11th March 2011, 08:14 AM	#2
Helmuth diyAudio Member Join Date: Oct 2008 Location: Winterswijk	http://www.triodedick.com/monobill_deel_1.htm kt88 pp transformerset AE. Automatic Electric Europe __________________ ( (( KUGELWELLE )) ) recent projects :OB-mk1 /fatboy / monitor-xl / Horn-AM / dappolito / td124-mk1-rb301 / Hybrid-pse / Vfet Last edited by Helmuth; 11th March 2011 at 08:20 AM.

11th March 2011, 09:30 AM	#4
Helmuth diyAudio Member Join Date: Oct 2008 Location: Winterswijk	measurements. frequency response without feedback. thd __________________ ( (( KUGELWELLE )) ) recent projects :OB-mk1 /fatboy / monitor-xl / Horn-AM / dappolito / td124-mk1-rb301 / Hybrid-pse / Vfet

11th March 2011, 10:04 AM	#5
Helmuth diyAudio Member Join Date: Oct 2008 Location: Winterswijk	AE does supply transformer-sets for triode dick designs. http://www.ae-europe.nl/voedingstrafo_engels.htm the kt88 set. KT88 PP 4 x tube Electro Harmonix KT88 2 x output transformer 2 x choke 10H 200mA 1 x power supply € 436 __________________ ( (( KUGELWELLE )) ) recent projects :OB-mk1 /fatboy / monitor-xl / Horn-AM / dappolito / td124-mk1-rb301 / Hybrid-pse / Vfet Last edited by Helmuth; 11th March 2011 at 10:07 AM.

11th March 2011, 10:20 AM	#6
Helmuth diyAudio Member Join Date: Oct 2008 Location: Winterswijk	Welter highend UL output transformer PP-el84=Welter Ü 284 25Hz-58kHz -3dB price 70euro. Welter Audio Electronic************************************** **************************** Seit 1975 Or low cost Welter U3= 40euro PP el84 Welter Audio Electronic************************************ ****************************** Seit 1975 __________________ ( (( KUGELWELLE )) ) recent projects :OB-mk1 /fatboy / monitor-xl / Horn-AM / dappolito / td124-mk1-rb301 / Hybrid-pse / Vfet Last edited by Helmuth; 11th March 2011 at 10:25 AM.

11th March 2011, 11:29 AM	#7
Doz diyAudio Member Join Date: Jul 2010 Location: Sat Down	With both the above schematics, it would be wise to add 470K or so from the grid of the input to earth... __________________ "To err is human.. to make a real balls-up requires a computer"

11th March 2011, 05:55 PM	#9
Helmuth diyAudio Member Join Date: Oct 2008 Location: Winterswijk	Oeps mistake. transformerset monobill. MonoBill Electroharmonics kt88 and JJ ecc99. Inclusief 4 x EH KT88 en 2 x JJ ECC99 € 603,- __________________ ( (( KUGELWELLE )) ) recent projects :OB-mk1 /fatboy / monitor-xl / Horn-AM / dappolito / td124-mk1-rb301 / Hybrid-pse / Vfet

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