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_1026or 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
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.
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
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.
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/CheersGamve
Quote from: gamve on January 17, 2011, 05:04:23 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.
Quote from: stevenvalve on January 21, 2011, 12:40:16 AMQuote from: gamve on January 17, 2011, 05:04:23 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 PartsconnectionsDo 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?