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1: Tube DIY Asylum, RE: No (0.00)
Posted by Ejam on 2023-12-13, 14:50:00 (120.152.77.160)
Eric, yes you can. Here are the results of some Pentode driver stage experiments done awhile back. The idea was to see what could be done combining Pentodes and CCS's. Generally, you can't load a .......
2: SET Asylum, RE: Operating Point and Load impedance for GM70 (0.00)
Posted by Ejam on 2019-02-03, 15:54:08 (101.162.89.214)
Sorry for being late to the party. I have used Paul Joppa's triode load equation for years and it gives a pretty good estimate for the transformer load. The equation is V/I - 2.38*rp = Load So for you .......
3: Tube DIY Asylum, RE: how to remove feedback loops (0.00)
Posted by Ejam on 2017-06-11, 18:31:50 (123.211.227.121)
Vinnie I appreciate the desire to have a no feedback amplifier, they do if well designed sound good, but with the UA-1 you have three main problems to overcome. First, without overall feedback the .......
4: K&K Audio / Lundahl Transformers, Mu Output CCCS (0.00)
Posted by Ejam on 2015-11-11, 23:53:00 (123.211.221.213)
Kevin Do your CCCS boards have the facility for mu output? Regards Anthony .......
5: K&K Audio / Lundahl Transformers, RE: Expected Power Output (0.00)
Posted by Ejam on 2015-09-14, 01:00:18 (124.186.220.137)
Is the common cathode CCS one of yours? I was thinking of using the GU50 (I have a stack of them) with the 1620CFB output transformer at 600V, which I believe is the maximum for your PS board. Given y .......
6: K&K Audio / Lundahl Transformers, Expected Power Output (0.00)
Posted by Ejam on 2015-09-13, 16:03:52 (124.186.220.137)
Kevin Your new Kt120/150 amp project, what power output do you expect? Further, what B+ voltage and current are you going to run the output stage at? .......
7: Tube DIY Asylum, RE: Can I use a resistor instead of the choke for coupling to the 813? (0.00)
Posted by Ejam on 2014-10-31, 15:27:55 (1.120.191.68)
Vinnie2 You might want to adjust the cathode resistor on the first section of the 6EM7 from 12k to 1k2. The 6EM7 configuration looks remarkably like Eric Barbour's front end to his Class A2 SV811-10 a .......
8: Tube DIY Asylum, RE: SE 7788 DC SV811-3........... (0.00)
Posted by Ejam on 2014-05-13, 18:44:48 (124.186.240.17)
Willie Going to post a schematic for us or perhaps a description of the amp and ps. Be much appreciated. .......
9: K&K Audio / Lundahl Transformers, RE: WAF direct coupled integrated Push Pull amplifier (0.00)
Posted by Ejam on 2014-02-19, 21:24:22 (202.0.189.94)
Frank A few questions, if I may. First, can you detail your modifications to the PP2C cascode front end, and second relating to the PP2C cascode, doesn't this have enough gain to drive your kt120 outp .......
10: Tube DIY Asylum, RE: WE 310A : amplification factor?? (0.00)
Posted by Ejam on 2009-09-17, 01:42:25 (203.217.39.63)
Ziggy The gain is the transconductance multiplied by the load resistance. The 310A transconductance is approximately 1200 micromhos, so the gain will be 0.0012 x 100,000 = 120. This is theoretical gai .......
11: K&K Audio / Lundahl Transformers, RE: It's certainly good sounding alright (0.00)
Posted by Ejam on 2008-07-19, 19:05:03 (124.171.196.195)
Andy What were the other preamps at the shootout? .......
12: MagneQuest/Peerless Forum, Re: Line isolation - step down question. (0.00)
Posted by Ejam on 2006-11-29, 14:33:41 (203.206.38.249)
Ah, the mining boom capital of the world... and snow is definitely not on the agenda. Expect summers to reach 30 - 40C and winters 15 - 25C. Perth is a great city, completely different from Quebec Cit .......
13: MagneQuest/Peerless Forum, Re: Line isolation - step down question. (0.00)
Posted by Ejam on 2006-11-28, 14:33:22 (203.206.38.249)
Jeff Welcome to the "promised land". Just to put the road straight, neither of us is right. We followed the British with the road and electric thing, whereas Canadians followed the US. Choose your poi .......
14: Tube DIY Asylum, Got a schematic for the birthday present? (0.00)
Posted by Ejam on 2005-12-24, 14:20:55 (203.206.34.121)
Be interested in your circuit as I'm trying a push pull el84 amp along similar lines. Ejam .......
15: MagneQuest/Peerless Forum, Doctor L is there a circuit for the front? (0.00)
Posted by Ejam on 2005-12-06, 16:36:32 (203.206.69.24)
Jeff Can you please detail the SRPP driver circuit for us. With the 5687 or 6H30pi you will not get much gain out of this setup and will need a pretty healthy output from your line preamp, hence I sup .......
16: MagneQuest/Peerless Forum, Re: Wait until you try the Seth mk II !!! (0.00)
Posted by Ejam on 2005-12-03, 13:53:21 (203.206.33.206)
Jeff Can you briefly outline what has changed. Regards Ejam .......
17: Tube DIY Asylum, Gary Pimm's BBMCCCS (0.00)
Posted by Ejam on 2002-09-10, 23:43:37 (63.12.152.224)
Gary I was looking at your schematic for your 26 preamp and noticed that the output of the 26 was taken from the BBMCCCS and is called mu follower output. Where exactly is the take off point? As I und .......
Found total of 17 records, Query: , Author: Ejam in All Forums, Time: 0 sec.