Search found 15747 matches
- Thu Mar 18, 2010 9:30 am
- Forum: Everyones Projects
- Topic: My first 3 stager.
- Replies: 101
- Views: 25794
Then use a 68k - standard value, init. = 118V at anode. ( + / - resistor tolerance :wink: ) Though I think you will find the valve tolerance far exceeds and normal resistor variation, so don't get too hung up on exact voltages. If a circuit needs that accuracy then you will need to include some mea...
- Wed Mar 17, 2010 10:33 pm
- Forum: Beginners
- Topic: 7.5V @ 4A filament supply.
- Replies: 18
- Views: 6754
- Wed Mar 17, 2010 10:31 pm
- Forum: Everyones Projects
- Topic: My first 3 stager.
- Replies: 101
- Views: 25794
- Wed Mar 17, 2010 2:07 pm
- Forum: Beginners
- Topic: 7.5V @ 4A filament supply.
- Replies: 18
- Views: 6754
Well, you have got 1.66 ohms in the circuit, so at 4A thats 6.64v burnt. By the way, you can't just do 9v * 4A to work out the rating, as I mentioned before, adding the bridge and cap changes how current is drawn and alters the requirement. In this case its 4A = 4 * 1.61 amp from the transformer = 6...
- Wed Mar 17, 2010 12:20 pm
- Forum: Beginners
- Topic: 7.5V @ 4A filament supply.
- Replies: 18
- Views: 6754
- Tue Mar 16, 2010 11:32 am
- Forum: Assorted Stuff
- Topic: SimonFest
- Replies: 80
- Views: 22973
- Tue Mar 16, 2010 8:03 am
- Forum: Valves
- Topic: Are you sitting comfortably?....
- Replies: 28
- Views: 12251
- Tue Mar 16, 2010 8:01 am
- Forum: Assorted Stuff
- Topic: SimonFest
- Replies: 80
- Views: 22973
- Mon Mar 15, 2010 10:44 pm
- Forum: Assorted Stuff
- Topic: SimonFest
- Replies: 80
- Views: 22973
Lets calm down a bit, If Greg feels he has been offended, then its understandable he is upset, I dont think Andrew meant any such thing, but rather than dragging this out and attracting bystanders, why not, Andrew tell Greg simple that is was not meant as a disparaging remark, and why not Greg, give...
- Mon Mar 15, 2010 5:59 pm
- Forum: Assorted Stuff
- Topic: SimonFest
- Replies: 80
- Views: 22973
- Mon Mar 15, 2010 4:15 pm
- Forum: Assorted Stuff
- Topic: SimonFest
- Replies: 80
- Views: 22973
Fascinating weekend all in all and got to meet more of the guys, must be said both Steve S and Nick are real characters that don't quite fully come across on the forum (although DTB had warned me about Nick beforehand Very Happy ) Must have a word with that Mr Dave... Not sure you saw Steve S thoug...
- Mon Mar 15, 2010 2:06 pm
- Forum: Everyones Projects
- Topic: more on gm70 even more
- Replies: 31
- Views: 15863
so far we have a paralleled 1n4007 for the psu, a hammond 378 cx power tx a hammon 159T choke and a sotwer 8423 interstage I guess you mean series IN4007? Yes, 400 - 0 - 400 will be fine, I would use a full wave with that instead of a doubler though. That will give you something like 1100v. Still n...
- Mon Mar 15, 2010 12:21 pm
- Forum: New Users
- Topic: Nothing in partuicular
- Replies: 2
- Views: 3503
- Sun Mar 14, 2010 5:32 pm
- Forum: Everyones Projects
- Topic: Low Power SE project ( 6EM7 possibly )
- Replies: 121
- Views: 41357
- Sat Mar 13, 2010 11:13 pm
- Forum: Everyones Projects
- Topic: more on gm70 even more
- Replies: 31
- Views: 15863
In fact Ian, I am with Phil, I don't see how this is any different to the other thread. No real design I can see, just a list of unconnected thoughts with no sign of them coalescing into a actual design. I am (as it happens) building what is effectively a gm70 push pull for Ali, and I have built sev...