Author Topic: How to Build a killer Amp  (Read 45772 times)

Offline stevenvalve

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How to Build a killer Amp
« on: November 28, 2010, 06:57:41 PM »
Here are some pictures of the single ended class a triode amp, that i have finally finished. It runs, any of these tubes, 50-45 type tubes (RCA 250s Cunningham 350s PX25s- PX4s- RCA 245 45s) The driver tubes are Mullard- ECC32,or RCA-5691s,or 6SL7s, rectifier tubes are GEC Genalex- U52,  GEC- 5U4G, or nearly any rectifier tube. This is a full on unit, the parts are not cheap. but you can use want ever parts you like. This amp has choke input. I will show you how to make one, or more, if you want to build the best there is, but you need efficient speakers, you will have 2- 4.6 watts to play with. PX25s about 8-10 watts.  More soon, if there is any interest. How will it sound. Unsurpassed Magic.
« Last Edit: November 28, 2010, 08:28:47 PM by stevenvalve »

tuyen

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Re: How to Build a killer Amp
« Reply #1 on: November 29, 2010, 01:41:39 PM »
Hi Steve,

Just creamed my pants.

Cheers,
Tuyen

Offline ozcal

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Re: How to Build a killer Amp
« Reply #2 on: November 29, 2010, 01:53:29 PM »
Beautiful work Steven.
Looking forward to learning from you.
Gordon
Listening with my ears :)

crazikid

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Re: How to Build a killer Amp
« Reply #3 on: November 29, 2010, 04:03:37 PM »
sweet jesus.. look at all that unobtainium...

Offline gamve

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Re: How to Build a killer Amp
« Reply #4 on: November 29, 2010, 05:59:47 PM »
Hi Steve,
Will be watching this thread for developments and eagerly await your instructions. Jezz have a couple of sets of speakers crying out for this type of amplification. Some 16 ohm Tannoys, enclosures and cross overs not yet built and some Coral flat 10's. I still might chase the axiom 80's that are here locally and get them up to standard. Very kind of you to share your extensive knowledge on these amps.

Offline omodo

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Re: How to Build a killer Amp
« Reply #5 on: November 29, 2010, 07:54:15 PM »
yes piss the 89db speaker chat off to a thread about naksa amps or something ;)

any more details on the amp, schematics, etc? thread is a bit light on details to commit money on building it... or will we get there eventually?

choke input is good, nice big transformers, lots of film caps and 4 pole caps, looks like it has potential :)
« Last Edit: November 29, 2010, 08:00:16 PM by omodo »

Offline Jehuty

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Re: How to Build a killer Amp
« Reply #6 on: December 26, 2010, 01:06:43 PM »
Hi Steve,

Could you please tell us what parts do we need to build this amp? I'm in no rush to build this amp as I still need to get suitable speakers but I can always start to gather all the parts needed.

Thanks and Merry Christmas Steve  :)

William
Not all that matters can be measured, not all that can be measured matters.

Offline stevenvalve

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Re: How to Build a killer Amp
« Reply #7 on: December 31, 2010, 07:45:30 PM »
Hi Steve,

Could you please tell us what parts do we need to build this amp? I'm in no rush to build this amp as I still need to get suitable speakers but I can always start to gather all the parts needed.

Thanks and Merry Christmas Steve  :)

William
OK, lets start. Guys i what you to get these parts ASAP (Shinko Tantalums)  because they are running out and very very good. Go to Parts connection. You need 4 -1K2.  2- 56k. 2- 10k. 2 - 330K.  you want the 2 watt version. 1 watt will do but not as good.    SHINKOH-72854              SHINKOH-72860     SHINKOH-68192      

SHINKOH-72862  Allen bradleys are good,  2Watt only
« Last Edit: December 31, 2010, 08:14:05 PM by stevenvalve »

Offline stevenvalve

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Re: How to Build a killer Amp
« Reply #8 on: December 31, 2010, 08:01:48 PM »
And these ( 3 - CMC 8-pin Gold Plated Teflon Tube Socket) plus these (2 - CMC 4-pin Gold Plated Teflon Tube Socket 2) Cheap off Ebay. You will run, 1 Rectifier, 2 driver, and 2 power valves. There will be more parts that you can get from parts connection but they are not that cheap.
« Last Edit: December 31, 2010, 08:04:59 PM by stevenvalve »

Offline stevenvalve

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Re: How to Build a killer Amp
« Reply #9 on: December 31, 2010, 08:12:47 PM »
These.  2- SOLEN-116-62332-200uf / 400VDC, PB Series.  2- SOLEN-108-51569-  100uf / 400VDC, PB Series, 2- JENSEN-71025-  470uf / 450v,   4 - pole,  Get these parts anywhere if its cheaper.

 

 
 

   
 

Offline stevenvalve

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Re: How to Build a killer Amp
« Reply #10 on: December 31, 2010, 08:23:40 PM »
You will need two trim pots, 2-100R is about right. I have some parts here if anyone whats them. I have a few mains transformers, Chokes,  trim pots and such stuff. All great vintage, not the rubbish they make today. i will list them here soon.
« Last Edit: December 31, 2010, 08:25:19 PM by stevenvalve »

Offline omodo

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Re: How to Build a killer Amp
« Reply #11 on: December 31, 2010, 09:00:20 PM »
thanks for the updates, I'm currently researching/evaluating some options for a new power amp project so this amp definitely has my interest, and if your dac is anything to go by it should sound very good

looking at the pics it looks dc coupled, is this a loftin-white derivative? any chance of a schematic or some more details on the circuit?

Offline gamve

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Re: How to Build a killer Amp
« Reply #12 on: January 02, 2011, 04:46:34 PM »
Ok, Shinkohs, capacitors and valve sockets ordered. Looks like the shinkoh 56K 2W ones will be hard to find. Any other ideas Stevenvalve on where to find them? Tried HI-Fi Collective in the UK as well as parts connection with no luck.
« Last Edit: January 02, 2011, 04:58:38 PM by gamve »

Offline kajak12

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Re: How to Build a killer Amp
« Reply #13 on: January 02, 2011, 06:10:33 PM »
Ok, Shinkohs, capacitors and valve sockets ordered. Looks like the shinkoh 56K 2W ones will be hard to find. Any other ideas Stevenvalve on where to find them? Tried HI-Fi Collective in the UK as well as parts connection with no luck.
visit steve wait until he falls asleep and take them out of his amp! ;D
« Last Edit: January 02, 2011, 06:19:15 PM by kajak12 »
still discovering the link between electronics and audio reproduction.so much to learn and so little time

Offline gamve

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Re: How to Build a killer Amp
« Reply #14 on: January 02, 2011, 06:17:13 PM »
Hi Mario, I'm sure steven would appreciate that  ::)

Offline kajak12

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Re: How to Build a killer Amp
« Reply #15 on: January 02, 2011, 06:21:18 PM »
Hi Mario, I'm sure steven would appreciate that  ::)
dont worry about steve just replace them with similar value he will tweak and modd for 6 months to get his sound back again

still discovering the link between electronics and audio reproduction.so much to learn and so little time

Offline kajak12

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Re: How to Build a killer Amp
« Reply #16 on: January 02, 2011, 06:41:24 PM »
Ok, Shinkohs, capacitors and valve sockets ordered. Looks like the shinkoh 56K 2W ones will be hard to find. Any other ideas Stevenvalve on where to find them? Tried HI-Fi Collective in the UK as well as parts connection with no luck.
try posting on diy audio you never know somebody on our planet will have some

gamve havent you got enough hifi?
tasmania is a small island with the most hifi per person thanks to you
still discovering the link between electronics and audio reproduction.so much to learn and so little time

Offline stevenvalve

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Re: How to Build a killer Amp
« Reply #17 on: January 02, 2011, 10:57:16 PM »
Ok, Shinkohs, capacitors and valve sockets ordered. Looks like the shinkoh 56K 2W ones will be hard to find. Any other ideas Stevenvalve on where to find them? Tried HI-Fi Collective in the UK as well as parts connection with no luck.
Use an allan bradley or audio note. You can get away with a shinkoh 50K 2W, if you can find it.  A 1 watt shinkoh 56K is OK. it will do.

Offline gamve

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Re: How to Build a killer Amp
« Reply #18 on: January 02, 2011, 11:50:42 PM »
Thanks Steven. Will search for these others

Offline stevenvalve

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Re: How to Build a killer Amp
« Reply #19 on: January 03, 2011, 12:00:32 AM »
Now for the fun part. You need to find 2 chokes, but not just any chokes, but vintage potted oil, or potted 1930 -40s- 50s -60s chokes Chicago or UTC or what i use 1940s Freed oil, there is many more types, see what you can find on ebay or elsewhere. you will need no less than 10H  to 20H at about 100ohm  and around 180-200 ma, 400+ v. If you go too small  in Henry's, you will have more hum. There will be no feedback in this amp at all. We will passively minimise the hum latter, for some, with either choke imput and or other means, and that will depending on how much voltage we have at the tube. we are aiming at about 250 volt at the tube (1.5 watt) to 350 volt (2.5watt) and with a 250 globe 450v (4.6watts) at the tube, As we up the voltage to the tube the more power it will put out..  The mains trans will be around  350- 0 - 350, higher or lower depending on what you can find in the vintage market or make or get newer transformers. So we need about 350-0-350/ more or less, 1/ 5v (3amp) for rectifier, U52 or 5U4G.   2/ 6.3v ( 2-3amp) for drivers. RCA 5691or ECC32.  2/ 2.5v (3amp) for RCA 245 Globes or Rodgers long plate 45s.  2/ 7.5v (3amp) for RCA250 Globes  2 / 4v(3amp) for PX25s. Don't ask for schematics. His amp is for anyone to build, with no knowledge of drawings. You just need to be able to solder, cut copper. use wood, and use a sledge hammer, HA HA .  I will post close up pictures of my amps (section by section) and all you do is copy it monkey fashion. OK
« Last Edit: January 03, 2011, 12:44:25 AM by stevenvalve »