Search found 5642 matches
- Mon Apr 19, 2010 11:03 pm
- Forum: Valves
- Topic: se output transformer question....
- Replies: 23
- Views: 15923
- Mon Apr 19, 2010 10:38 pm
- Forum: Valves
- Topic: se output transformer question....
- Replies: 23
- Views: 15923
Hi thomas, which version of the WE91s did you build? Which valves? I built mine maybe 4 years ago with the original Hammond 1627SE opts. I had some AE c cores made for another amp and have been using those since, though I've just put the Hammonds back in in an attempt to rationalise... I don't know ...
- Sun Apr 18, 2010 9:37 pm
- Forum: Everyones Projects
- Topic: Building an Aikido 'all in one' headphone amp
- Replies: 25
- Views: 14905
R11 = The manual suggests 1k but theses are missing - will have to order some. As Andrew says, well worth getting a kit of resistors from Rapid, or I can send you a couple. http://www.rapidonline.com/Electronic-Components/Resistors-Potentiometer/Carbon-Film-Resistors/CR25-Carbon-film-resistor-kits/...
- Sat Apr 17, 2010 8:30 pm
- Forum: Everyones Projects
- Topic: Building an Aikido 'all in one' headphone amp
- Replies: 25
- Views: 14905
Hi Mark, Right, I've had a think back to when I breadboarded one of these two or three years ago, may be more. Hopefully I've remembered correctly! As Andrew says, the first valve is the amplifier - the 6CG7. R3 and R4 are the cathode resistors. The second valve forms a White cathode follower and pr...
- Tue Apr 06, 2010 9:41 pm
- Forum: Speakers
- Topic: Vampyrs get some high heels
- Replies: 4
- Views: 3537
Re: Vampyrs get some high heels
Is it worth trying filling in the front of the slippers? Might give you a bit more help from the floor?SimonC wrote:Bass has dropped away a little
- Tue Apr 06, 2010 9:38 pm
- Forum: Everyones Projects
- Topic: 13E1 SE
- Replies: 458
- Views: 111665
- Tue Apr 06, 2010 12:40 pm
- Forum: Assorted Stuff
- Topic: Speccing SE Output Transformers
- Replies: 11
- Views: 3235
- Sun Apr 04, 2010 9:46 pm
- Forum: Buying and Selling
- Topic: for sale, the lot
- Replies: 44
- Views: 17395
- Sun Apr 04, 2010 12:01 am
- Forum: Everyones Projects
- Topic: another 6s4s single ended amp
- Replies: 108
- Views: 39848
- Sat Apr 03, 2010 11:55 pm
- Forum: Buying and Selling
- Topic: for sale, the lot
- Replies: 44
- Views: 17395
Now then Ant, take a deep breath and hang in there. Things may be shite today, they may be shite tomorrow, and they might even be shite next week or even next month too. But you know you're going to regret it one day. The circling vultures might like to think if a little support might be more approp...
- Sun Mar 28, 2010 7:48 pm
- Forum: Speakers
- Topic: Me new 8" Full Rangers - Tang Band w8-1772
- Replies: 322
- Views: 132938
- Sun Mar 28, 2010 7:40 pm
- Forum: Everyones Projects
- Topic: more on gm70 even more
- Replies: 31
- Views: 15868
- Sun Mar 28, 2010 7:37 pm
- Forum: Beginners
- Topic: Loadlines - voltage swings and driving valves (6EM7 again)
- Replies: 22
- Views: 7327
- Sun Mar 28, 2010 7:36 pm
- Forum: Beginners
- Topic: Loadlines - voltage swings and driving valves (6EM7 again)
- Replies: 22
- Views: 7327
...so the net effect on the load line is the actual grid voltage in is less that it seems, so a loss in gain, and given that ra, µ, and gm are linked, reducing gain while leaving gm the same will mean ra has to increase Okay, think I get it. Basically, an unbypassed cathode resistor has the effect ...
- Sun Mar 28, 2010 1:11 pm
- Forum: Beginners
- Topic: Loadlines - voltage swings and driving valves (6EM7 again)
- Replies: 22
- Views: 7327
I had a read of MJ last night and he says that not bypassing the cathode resistor increases the valve's anode resistance. Presumably this flattens the plate curves (V against I) but how would I plot loadlines etc. and work out swing if the curves aren't the same? Or is there a trick somewhere? Sorry...