Author Topic: How to Build a killer Amp  (Read 45782 times)

Offline stevenvalve

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Re: How to Build a killer Amp
« Reply #20 on: January 03, 2011, 12:08:35 AM »
 Here is a link to give you an idea of what you are looking for, example chokes. But these are a little low in Hennri. With these you will need to run choke imput
http://cgi.ebay.com.au/ws/eBayISAPI.dll?ViewItem&item=350423359718&ssPageName=STRK:MEWAX:IT

Offline stevenvalve

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Re: How to Build a killer Amp
« Reply #21 on: January 03, 2011, 12:13:50 AM »
To run choke imput, a nice choke for that, is 1/ UTC- CG 40  10H about 200 ma, 1950s. United transformer company, New York

Offline gamve

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Re: How to Build a killer Amp
« Reply #22 on: January 03, 2011, 12:34:49 AM »
Hi Steven,
Are these suitable http://cgi.ebay.com.au/2-X-POTTED-ATC-10H-200mA-150-OHM-FILTER-CHOKE-/290488109946?pt=Vintage_Electronics_R2&hash=item43a270cb7a#ht_1879wt_1026
or would they suit the KD. I have some UTC here already marked CG-40, 10 HYS, 200 ma DC, DCR 10 ohms, MIPOT 1750 V RMS. I got these earlier for my KD.
Ha Ha...are you a mind reader? Beat me to the post

Offline stevenvalve

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Re: How to Build a killer Amp
« Reply #23 on: January 03, 2011, 12:41:51 AM »
Hi Steven,
Are these suitable http://cgi.ebay.com.au/2-X-POTTED-ATC-10H-200mA-150-OHM-FILTER-CHOKE-/290488109946?pt=Vintage_Electronics_R2&hash=item43a270cb7a#ht_1879wt_1026
or would they suit the KD. I have some UTC here already marked CG-40, 10 HYS, 200 ma DC, DCR 10 ohms, MIPOT 1750 V RMS. I got these earlier for my KD.
Ha Ha...are you a mind reader? Beat me to the post
look at the max working voltage, its to low. even for killerdac. the chokes need to be good for 400+v, most are, but these are aeroplane chokes and often too low on voltage.
« Last Edit: January 03, 2011, 12:48:48 AM by stevenvalve »

Offline gamve

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Re: How to Build a killer Amp
« Reply #24 on: January 03, 2011, 12:48:53 AM »
Yep see what you mean. Am I best to try and get another pair the same. Is it true that you need similar for both the amp and the KD?
Sorry for the novice questions.

Offline stevenvalve

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Re: How to Build a killer Amp
« Reply #25 on: January 03, 2011, 12:52:56 AM »
Yep see what you mean. Am I best to try and get another pair the same. Is it true that you need similar for both the amp and the KD?
Sorry for the novice questions.
No, they do not have to be the same,  I have some 2/ CG40s. mite sell them, let you know.

Offline gamve

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Re: How to Build a killer Amp
« Reply #26 on: January 03, 2011, 01:02:21 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

Hi Steven
Looks like a decision needs to be made on what output is needed before searching for a power transformer. Only guessing but 97db at 1W efficient speakers 2.5 to 4.6 watts should be more than ample? What are your thoughts on this or more importantly how much difference does the extra headroom add/detract from the sound quality.

Offline gamve

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Re: How to Build a killer Amp
« Reply #27 on: January 03, 2011, 01:12:59 PM »
Hi Fi Collective UK have the 56K 2W tantalum resistors....not cheap... :o

Offline stevenvalve

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Re: How to Build a killer Amp
« Reply #28 on: January 06, 2011, 04:51:29 PM »
I have put some transformers and stuff in the parts section for the killer amp
All about the Killerdac > Buy/Sell/Give/Take > DIY parts or services for sale
« Last Edit: January 06, 2011, 04:56:27 PM by stevenvalve »

Offline stevenvalve

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Re: How to Build a killer Amp
« Reply #29 on: January 11, 2011, 05:59:27 PM »
Here is a picture of the underside driver tube. I will post a series of pictures soon.

crazikid

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Re: How to Build a killer Amp
« Reply #30 on: January 11, 2011, 09:02:23 PM »
how are the duelunds sounding in your amp?

Offline stevenvalve

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Re: How to Build a killer Amp
« Reply #31 on: January 11, 2011, 11:31:52 PM »
how are the duelunds sounding in your amp?
I have just put in 400Volt duelunds into the DAC, will let you guys know soon,  if they cut it after run in.

crazikid

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Re: How to Build a killer Amp
« Reply #32 on: January 12, 2011, 09:28:28 AM »
I have just put in 400Volt duelunds into the DAC, will let you guys know soon,  if they cut it after run in.

Does it matter what uF size cap can be used??

Offline kajak12

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Re: How to Build a killer Amp
« Reply #33 on: January 12, 2011, 09:05:53 PM »
I HAVE USED 2.2 UF AND 2.7UF  (THE 2.7 uf more weight)  had to retune my fcuken system for it
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 #34 on: January 17, 2011, 05:04:23 PM »
Hi Steve,
Noticed the duelands in the last picture. Do we need to get these underway or are you just trying them out at the moment? From what I can gather the duelands take a while to get. What type and voltage are they/
Cheers
Gamve

Offline stevenvalve

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Re: How to Build a killer Amp
« Reply #35 on: January 21, 2011, 12:40:16 AM »
Hi Steve,
Noticed the duelands in the last picture. Do we need to get these underway or are you just trying them out at the moment? From what I can gather the duelands take a while to get. What type and voltage are they/
Cheers
Gamve
I use dueland 400v .47 in the amps. also very good, is the audionote copper pipe paper in oil .47 not the newer oil audionotes, they are not as good. The duelands take forever to get, dont get them from partsconnection unless they are in stock, but they lie a lot, take your money and then tell you they dont have them.

Offline gamve

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Re: How to Build a killer Amp
« Reply #36 on: January 21, 2011, 06:32:01 PM »

I use dueland 400v .47 in the amps. also very good, is the audionote copper pipe paper in oil .47 not the newer oil audionotes, they are not as good. The duelands take forever to get, dont get them from partsconnection unless they are in stock, but they lie a lot, take your money and then tell you they dont have them.

My other parts turned up today from Partsconnections
Do you know if Mike Lenehan gets the duelands quicker or cheaper? It took months to get the caps for my ML1 ultra upgrade. Will ring Mike and ask. Would the paper in oil Ampohm caps be worth a try?

Offline stevenvalve

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Re: How to Build a killer Amp
« Reply #37 on: January 22, 2011, 12:33:34 AM »

I use dueland 400v .47 in the amps. also very good, is the audionote copper pipe paper in oil .47 not the newer oil audionotes, they are not as good. The duelands take forever to get, dont get them from partsconnection unless they are in stock, but they lie a lot, take your money and then tell you they dont have them.

My other parts turned up today from Partsconnections
Do you know if Mike Lenehan gets the duelands quicker or cheaper? It took months to get the caps for my ML1 ultra upgrade. Will ring Mike and ask. Would the paper in oil Ampohm caps be worth a try?
ask someone who has tried them.

Offline gamve

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Re: How to Build a killer Amp
« Reply #38 on: January 24, 2011, 11:46:04 PM »
Mike had a pair of dueland VSF 400V 0.47uf in stock....no waiting for these...timing himing  ;)

Offline kajak12

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Re: How to Build a killer Amp
« Reply #39 on: January 30, 2011, 03:02:23 AM »
killer amp
still discovering the link between electronics and audio reproduction.so much to learn and so little time