Search found 374 matches
- Sat May 18, 2013 5:22 pm
- Forum: Everyones Projects
- Topic: REDD47 - Legendary Abbey Road preamp build - question !
- Replies: 17
- Views: 12149
.....Finished..... and beautiful to record with - very much recommend this as a recording preamp for anyone into diy recording. Forgive the poor quality of the hasty iphone pic. http://i55.photobucket.com/albums/g159/pedrocortez/14A788D1-3582-4B55-846B-83A61BD5740C-1107-00000104A6169E5E_zps2b1427db....
- Sat May 18, 2013 5:18 pm
- Forum: Everyones Projects
- Topic: 6EM7 into EL34 ?
- Replies: 18
- Views: 13030
6EM7 into EL34 ?
Hi all, my main amp for last 2 years has been the 6EM7 into 300B. http://www.audiodesignguide.com/my/new300bxls2004/new300bxls.html Now pretty much the last pair of 300B's has packed in this week ( well one of the pair and I'm left with one lone EH300B ) - I've had bad experience of both EH 300B's a...
- Thu May 16, 2013 10:20 pm
- Forum: Everyones Projects
- Topic: It is about time I built a push pull amplifier
- Replies: 171
- Views: 44710
Ed, I have just finished a dual channel mic pre with Phantom power. I used Ian Bell's simple phantom circuit off GroupDiy. Worth a go perhaps. I have a couple of Ian's phantom pcbs to use in future projects but built the current used circuit on perfboard and its works fine. It runs off a 2x25v toroi...
- Thu May 16, 2013 11:49 am
- Forum: Buying and Selling
- Topic: TJ Meshplate PX25 - Pair
- Replies: 2
- Views: 1847
- Wed May 15, 2013 10:38 pm
- Forum: Buying and Selling
- Topic: TJ Meshplate PX25 - Pair
- Replies: 2
- Views: 1847
TJ Meshplate PX25 - Pair
Hi all, I have a pair of lovely TJ Meshplate PX25s that I bought from Steve on this forum a couple of years ago, and I haven't been able to use them at all so far ( other studio projects taking all my time ) For sale for £60 the pair for collection from Leeds. ( Or post to cover costs, delivered con...
- Tue Apr 30, 2013 9:36 pm
- Forum: Everyones Projects
- Topic: REDD47 - Legendary Abbey Road preamp build - question !
- Replies: 17
- Views: 12149
Hi All, some progress on the dual REDD mic preamp for those that are interested in the muso studio side of things.....its all valves at the end of the day. http://i55.photobucket.com/albums/g159/pedrocortez/46645D56-B8C0-474A-B752-73382214EB31-417-0000003D6FF71E2A_zpscad7c7aa.jpg http://i55.photobuc...
- Mon Apr 15, 2013 10:26 pm
- Forum: Everyones Projects
- Topic: REDD47 - Legendary Abbey Road preamp build - question !
- Replies: 17
- Views: 12149
- Sun Apr 14, 2013 5:16 pm
- Forum: Everyones Projects
- Topic: REDD47 - Legendary Abbey Road preamp build - question !
- Replies: 17
- Views: 12149
- Sat Apr 13, 2013 3:13 pm
- Forum: Everyones Projects
- Topic: REDD47 - Legendary Abbey Road preamp build - question !
- Replies: 17
- Views: 12149
- Sat Apr 13, 2013 1:37 pm
- Forum: Everyones Projects
- Topic: REDD47 - Legendary Abbey Road preamp build - question !
- Replies: 17
- Views: 12149
Thanks Mike that's really helpful - I hadn't considered that at all ! I may stick with the 390K screen R for now. Do you have any experience of of seeing voltages change in input circuits when the chassis is additionally earthed from the signal ground - even if the chassis inst electrically connecte...
- Fri Apr 12, 2013 7:47 pm
- Forum: Everyones Projects
- Topic: REDD47 - Legendary Abbey Road preamp build - question !
- Replies: 17
- Views: 12149
OK thanks Mike, I think I will play with a variable resistor in the srceen circuit and see what value gives a slightly lower screen and slightly increased plate voltage. I'm getting 108v across 390K - so about 0.3ma screen grid current which seems reasonable - maybe it was meant to be this way - but...
- Fri Apr 12, 2013 4:49 pm
- Forum: Everyones Projects
- Topic: REDD47 - Legendary Abbey Road preamp build - question !
- Replies: 17
- Views: 12149
- Thu Apr 11, 2013 10:17 pm
- Forum: Everyones Projects
- Topic: REDD47 - Legendary Abbey Road preamp build - question !
- Replies: 17
- Views: 12149
thanks Phil - that was fast ! That's what I'm thinking too - based on fact that 0.3ma seems to be running through the screen grid and the 390K screen resistor - I'm assuming there will be a voltage drop of about 0.3ma x 390K = 117v vs the Ht which is at 205v . So a screen voltage of around 205-117 =...
- Thu Apr 11, 2013 9:58 pm
- Forum: Everyones Projects
- Topic: REDD47 - Legendary Abbey Road preamp build - question !
- Replies: 17
- Views: 12149
REDD47 - Legendary Abbey Road preamp build - question !
Hi all, I have been building 2 channels of point to point microphone preamps for my little recording studio following the renowned REDD47 circuit used at Abbey Road on many, many Beatles recordings. Here's a link to a doc with the schematic which some of you will find interesting for its own sake as...
- Thu Apr 11, 2013 7:47 pm
- Forum: Buying and Selling
- Topic: WTB - 2x High Quality EF86 or EF806's
- Replies: 2
- Views: 2451