Search found 20148 matches
- Mon Jan 26, 2009 3:00 pm
- Forum: Beginners
- Topic: Buffer/unity gain amps.
- Replies: 146
- Views: 57936
Ah so ~ I've just looked at the 5670 data sheet and it says for 50V @ 5mA the cathode should be positive 1.5V. By quick calculation that makes the resistors 1.5k. There's still something seriously amiss somewhere cos for it not to work even with 2k2 is completely bonkers. It's almost as though A. t...
- Mon Jan 26, 2009 2:38 pm
- Forum: Beginners
- Topic: Buffer/unity gain amps.
- Replies: 146
- Views: 57936
You shouldn't be getting any -V on the grids, and the cathodes should be positive of your 0V. looks like they're still forward conductive. Perhaps the resistors need to be bigger! http://livinginthepast-audioweb.co.uk/kbf/th_scratchhead.gif You have to appreciate I was just guessing about the resist...
- Mon Jan 26, 2009 1:50 pm
- Forum: Buying and Selling
- Topic: Wanted 240 to 110 or 120v step down
- Replies: 8
- Views: 4433
- Mon Jan 26, 2009 1:44 pm
- Forum: Assorted Stuff
- Topic: following links with opera
- Replies: 11
- Views: 4938
- Mon Jan 26, 2009 1:39 pm
- Forum: Assorted Stuff
- Topic: following links with opera
- Replies: 11
- Views: 4938
- Mon Jan 26, 2009 1:32 pm
- Forum: Buying and Selling
- Topic: valve bases
- Replies: 13
- Views: 6150
they may be useful, but they are certainly NOT that useful... Could be that I'm super-fussy of course :D I was thinking of paying something like 50p each max...to save 10 mins punching and drilling... Don't know who's going to make them for 50p ~ even if you DIY a sheet of metal alone would be more...
- Mon Jan 26, 2009 1:28 pm
- Forum: Buying and Selling
- Topic: valve bases
- Replies: 13
- Views: 6150
I've just re-read the post Mike and realise I didn't understand the first sentence........ what is it you were going to say, and what is it that Nick already did??? Give us a clue ? What does it do,or fit :?: are they 12 pin.. or the large british 4 pin, but with a fancy middle ? I am guessing the ...
- Mon Jan 26, 2009 1:17 pm
- Forum: Everyones Projects
- Topic: Loftin White PX25
- Replies: 364
- Views: 162400
I don't recall saying that they should simply be removed. I prefer to use a different topology, one that does t require them. I fully admit that this is partly borne of prejudice. Let he who hath no sin cast the first stone. However, in a driver stage there was certainly an improvement, even just s...
- Mon Jan 26, 2009 1:10 pm
- Forum: Everyones Projects
- Topic: Loftin White PX25
- Replies: 364
- Views: 162400
- Mon Jan 26, 2009 1:14 am
- Forum: General Vinyl
- Topic: helius standard arm info
- Replies: 13
- Views: 8166
- Mon Jan 26, 2009 12:58 am
- Forum: Buying and Selling
- Topic: valve bases
- Replies: 13
- Views: 6150
- Mon Jan 26, 2009 12:54 am
- Forum: Assorted Stuff
- Topic: goat accused of armed robbery
- Replies: 2
- Views: 2056
- Mon Jan 26, 2009 12:52 am
- Forum: Assorted Stuff
- Topic: What is HiFi?
- Replies: 130
- Views: 39674
- Mon Jan 26, 2009 12:50 am
- Forum: Beginners
- Topic: Buffer/unity gain amps.
- Replies: 146
- Views: 57936
The only problem is, if it were the jfets, then if nothing changes, why wouldn't it happen again, in another 3 or 4 weeks? We need to identify the cause as well as the duff bits. 'Tis a bit worrying ... I think the phono pre would have been 'On' before I connected up the buffer (back to front). Jul...
- Mon Jan 26, 2009 12:33 am
- Forum: Everyones Projects
- Topic: Loftin White PX25
- Replies: 364
- Views: 162400