Search found 369 matches
- Mon Jul 17, 2017 7:00 am
- Forum: Valves
- Topic: The Humble EL34
- Replies: 33
- Views: 30062
Re: The Humble EL34
The biasing resistor on the lm317 will need to change depending on choice of valve ... and there's a quite a range between ecc83 etc, so let's assume that this is just a potential circuit with quite a lot of maths to do depending on the valves used. I think the PSU is quite ugly too but that depend...
- Mon Apr 20, 2015 5:06 pm
- Forum: Everyones Projects
- Topic: GK-71 as a pentode.
- Replies: 47
- Views: 22867
I will have another listen this afternoon when I get back from my physio class. Unless it sounds better than it did yesterday it's back to triode mode. PS the driver valve CCS is above the anode. I am not aware of the schematics of your amp. If you are trying to reproduce the RH813 with GK71 (someh...
- Mon Apr 20, 2015 7:47 am
- Forum: Everyones Projects
- Topic: GK-71 as a pentode.
- Replies: 47
- Views: 22867
And does having a CCS on the driver cock things up feedback wise ? http://rh-amps.blogspot.co.uk/2014/06/rh813-flagship-project.html Yes it does change things a lot. I do not know whether you have a CCS above the anode of the driver tube, or below the cathode? If above the anode the ratio between l...
- Thu Apr 16, 2015 10:46 pm
- Forum: Everyones Projects
- Topic: GK-71 as a pentode.
- Replies: 47
- Views: 22867
- Sun Nov 09, 2014 7:43 pm
- Forum: Everyones Projects
- Topic: DHT Heater using VCCS - PCB or Kit (Possible Group buy)
- Replies: 1183
- Views: 415697
- Sun Nov 09, 2014 7:11 pm
- Forum: Everyones Projects
- Topic: DHT Heater using VCCS - PCB or Kit (Possible Group buy)
- Replies: 1183
- Views: 415697
My amps are monoblocks so I would need 2. The amps are in the process of a power supply rebuild at the moment (dual mono) so it would be an ideal time to incorporate modified filament supplies. I have to check with the shop where I buy the units of the same type as the one shown in the RH813 blog e...
- Sun Nov 09, 2014 2:57 pm
- Forum: Everyones Projects
- Topic: DHT Heater using VCCS - PCB or Kit (Possible Group buy)
- Replies: 1183
- Views: 415697
I'd love to try them on my GK-71 but I fear the conversion work is beyond my skill level. :( If you'd like to make a pair for me I would cover your costs, and postage. :) I really believe that's not something you couldn't do yourself - particularly having in mind that you are able to build amps. Th...
- Sun Nov 09, 2014 9:16 am
- Forum: Everyones Projects
- Topic: DHT Heater using VCCS - PCB or Kit (Possible Group buy)
- Replies: 1183
- Views: 415697
- yes, they are good for GM70... Well, currently working on the RH70 (with GM70 tubes, obviously) I could not resist commenting... The relentless grind of DIYers going towards DC for the filaments, and the various solutions to achieve DC heated filaments has almost had me drawn in the wrong directi...
- Sat Nov 08, 2014 2:32 pm
- Forum: Valves
- Topic: Cheap 4Wpc valve
- Replies: 9
- Views: 8762
- Fri Nov 07, 2014 7:01 pm
- Forum: Valves
- Topic: Cheap 4Wpc valve
- Replies: 9
- Views: 8762
- Thu Nov 06, 2014 8:10 pm
- Forum: Valves
- Topic: Cheap 4Wpc valve
- Replies: 9
- Views: 8762
Re: Cheap 4Wpc valve
Another interesting one from Thomas Mayer : 6GE5 : get your 12-pin sockets out ! As usual, a beam tetrode used as triode. It seems that for some people tube evolution stopped with triodes... or is it that their knowledge and expertise stopped there? I must say I am bored with "incredibly linea...
- Wed Nov 05, 2014 5:31 am
- Forum: Everyones Projects
- Topic: Jumping back in...
- Replies: 19
- Views: 15589
Re: Jumping back in...
In truth I've had a whirlwind year, changing jobs from part time with 50 mile every day commute + crappy min wage extra job, to a full time much nearer job that I don't like nearly as much, so I need something to distract me from that. Now the clocks have gone back it's time to fire up the solderin...
- Fri Oct 24, 2014 2:48 pm
- Forum: Everyones Projects
- Topic: A Final Go With Vinyl
- Replies: 49
- Views: 22635
Romy, I wish my Serbian was as good as your English. Then I'd be able to confuse you as much in your language as you do in mine! :D I would like to point out that Roman is Ukrainian, thus his mother tongue or first language is Ukrainian - not Serbian. As for the DL103 - I have read so much praise a...
- Sun Oct 05, 2014 8:10 am
- Forum: Everyones Projects
- Topic: GK-71 - economical build.
- Replies: 497
- Views: 174449
It's a long thread, and it's taking a long time to unfold - so there's a few issues I remember, and a few I keep forgetting. What I do remember is that HF AC is neither wanted nor welcome. A nasty source of destructive influences that affects the sound. What I forget constantly is whether any of the...
- Tue Sep 16, 2014 4:31 pm
- Forum: Everyones Projects
- Topic: 833A (GU-48) Amp
- Replies: 1255
- Views: 480336