• Hello and Welcome to HiFiVision.com - an online community for the home entertainment and tech enthusiasts!

    If you would like to ask a question, participate in a discussion and view attachments please Register yourself.

DIY Single Ended Tube/SS Amplifier Kit - Preliminary Inquiry

Hiten

Well-Known Member
Joined
Oct 17, 2008
Messages
2,508
Likes
1,173
Points
113
Location
Kalyan
#1
Hi all,
I think I can use low power SET amp for some of my music. Am Looking for some DIY/semi assembled single ended Tube kits or good designs with easily available components. Should be simple to assemble. I understand with quality components they get expensive on logarithmic scale. :) Don't have any clue how much they cost. So no budget till I find cheapest good design.
Selecting Solid state design is very easy. That will be AmpCamp* by Nelson Pass. But As I have some tubes (ECL82) am leaning towards it more. Can buy new tubes also as nothing is fixed. I also understand safety measures with high voltages involved. I have limited understanding of electronics but I am looking for...

1) Most Important : Good well appreciated simple published circuit design. (Will be joy to start from scratch. Other too can join)
2) Low power 2 to 3 watts is OK.
3) No push pull design.
4) Am Ok with regular normal affordable OT.
5) No expensive tubes. (No 300B though they are V. Good).
6) Amplification stage Tube based but rest of the design SS is perfectly all right.
7) Chinese designs are cheap but doubt their genuine circuit design and components. unless some kind knowledgeable soul guides me to it.
8) P2P will be icing on the cake.

* Can anyone tell how much AmpCamp Amp. Only PCB+Components costs ? (No heatsinks, Connectors, enclosure etc.)

Thanks and regards.
 
SPONSORED ADS

SPONSORED ADS

yogibear

Well-Known Member
Joined
Jul 31, 2014
Messages
1,379
Likes
723
Points
113
Location
Jaipur
#2
My suggestion is, don’t build an amp around a tube just because you have some in stock. ECL82 is not a good choice. Why not try 6L6 or EL84 SE ?

I can suggest some very nice kits if interested.

2-3 watts SE tube amps are very musical and great to start with.
 

Hiten

Well-Known Member
Joined
Oct 17, 2008
Messages
2,508
Likes
1,173
Points
113
Location
Kalyan
#4
Thanks for the Link Hari.
Yogibear please do give suggestions/links. As I have already said I can buy new tubes too.
regds.
 

Hiten

Well-Known Member
Joined
Oct 17, 2008
Messages
2,508
Likes
1,173
Points
113
Location
Kalyan
#6
Thanks for the link Keith. Amplification by Tube is what I am looking for. Think of it as adding tube flavour to my system. As said in my CNC phono thread. I will be putting it with phono pre which will drive wideband single speaker (Later on). Will be good for some vocal music I guess.
Thx and regds.
 

yogibear

Well-Known Member
Joined
Jul 31, 2014
Messages
1,379
Likes
723
Points
113
Location
Jaipur
#7
I hope to complete my Class A DC SS preamp soon and I have already completed the 6DJ8 SE tube buffer. The combo will give me a chance to directly compare the DHT Tube pre VS the Tube buffer - SS pre combo, both driving the same tube amplifier. Its an inexpensive DIY kit, very easy to make.

Out of curiosity, I am also building a pair of mono blocks, 15 wpc pure Class A amp with double triode tube pre-stage (SRPP). Not expensive and great VFM.

I am just a "few days of dedication away" on completing both above projects and will soon share the details if nothing goes up in smoke and they do sound as intended !

If you can build from scratch, this EL84 SE is very nice:

http://www.audioxpress.com/article/a-beginner-6bq5-se-amp

Another one by a Jap audiophile is very nice as well: (A wonderful site for all SE amps you can build, very informative)

http://www.single-ended.com/Lagarto/el84se_diy.htm

Below these are Chinese, but I like them as they are point to point and what more can you ask for under $300 ? You can always change better resistors and caps later. Chassis and trafos are all nice:

https://www.amazon.com/FidgetFidget...8-12&keywords=single+ended+tube+amplifier+kit

https://www.amazon.com/Nobsound-Cla...keywords=single+ended+el34+tube+amplifier+kit
 

Hiten

Well-Known Member
Joined
Oct 17, 2008
Messages
2,508
Likes
1,173
Points
113
Location
Kalyan
#9
After searching I think I will start first by practicing before I get on to some mid hifi OK SET amp.
https://www.tubecad.com/2004/blog0005.htm
The third simple schematic above I have most of the parts. (AD712 and LM317) Lets see how this rudimentary circuit sounds. I guess most of the working is hidden in op amp and LM regulator. IF SUCCESSFUL I will try the next tube circuit on same link. which says "World’s Simplest SE Class-A amplifier". I have a feeling probably that circuit has some drawbacks (Probably bandwidth of single tube.?) This will be just practicing before I (may ) dwelve in to some Okayish High Fidelty SET Amp. if not there is always good option of SS AmpCamp Amp.
Regds.
 

Hari Iyer

Well-Known Member
Joined
Feb 8, 2010
Messages
2,578
Likes
1,434
Points
113
Location
Mumbai
#10
Any progress on this? Curious to know.
 
SPONSORED ADS

Hiten

Well-Known Member
Joined
Oct 17, 2008
Messages
2,508
Likes
1,173
Points
113
Location
Kalyan
#11
Bro, I have shorlisted few schematics for SET AMPs. need to select and search where parts can be obtained. As for AD712-LM317 SET Amp. no progress as my home is being repainted. Also a little bit of procrastination :p from my side. On the above link Can you tell me the 'adj' pin on LM317 what its about. I guess its is about bias setting but no value has been said. Also resistor marked '1' at bottom has no value or wattages. dont know f it is 1 ohm or 1 K or 1 M ???
Thanks and Regards
 

Hari Iyer

Well-Known Member
Joined
Feb 8, 2010
Messages
2,578
Likes
1,434
Points
113
Location
Mumbai
#12
@Hiten
As they have not mentioned any thing, it looks like 1 ohm to me. In the +ve cycle it's directly connected. Only -ve cycle has 1 ohm
 

Hari Iyer

Well-Known Member
Joined
Feb 8, 2010
Messages
2,578
Likes
1,434
Points
113
Location
Mumbai
#15

Hiten

Well-Known Member
Joined
Oct 17, 2008
Messages
2,508
Likes
1,173
Points
113
Location
Kalyan
#16
Yes joshua. I am following that thread along with some other more recent. As of now I have some links which I will share soon. Simple Single ended triode is challenging (Pushpull have more wide band, linear and power to accomodate various speaker criteria) I understand somewhat limitations of single ended so I have my requirement to that needs i.e. limited wideband, low power, No expensive tubes, and somewhat (will do) transformers.
Regards
 

Hari Iyer

Well-Known Member
Joined
Feb 8, 2010
Messages
2,578
Likes
1,434
Points
113
Location
Mumbai
#17
SE tubes especially the 300Bs are super expensive. Also the OPT is very fussy to work with. If these two things are sorted out then SE should be great. 2A3 tubes are relatively cheaper compared to the 300Bs.
If going SE, select the speakers first before you built the amp..
 

yogibear

Well-Known Member
Joined
Jul 31, 2014
Messages
1,379
Likes
723
Points
113
Location
Jaipur
#19
The biggest pain with tube amps could be the cost of tubes. 300B and there is another AD1. These cost as much as the amps alone.

High sensitivity speakers is a must with tube amps.
 

Hiten

Well-Known Member
Joined
Oct 17, 2008
Messages
2,508
Likes
1,173
Points
113
Location
Kalyan
#20
Bros,
Kindly read my first post point 5, I am aware of very good 300B Tube and have eliminated it from my basic needs.
Am also aware for low power, sensitivity of speakers plays important role.
Warm regards.
 
SPONSORED ADS

Top