Search found 56 matches
- Tue Mar 19, 2013 6:58 pm
- Forum: Sim City
- Topic: Drop Down Menus for selecting your tube
- Replies: 28
- Views: 62538
Thanks for the info Ray. I must admit I tried what you suggest and didn't get the drop-down menu , for some reason . In the meantime I have got this sort of drop-down set-up working with another guy's advice/files and the Norman Koren models : http://www.audio-talk.co.uk/phpBB2/viewtopic.php?p=10231...
- Mon Mar 18, 2013 6:33 pm
- Forum: Sim City
- Topic: Drop Down Menus for selecting your tube
- Replies: 28
- Views: 62538
Hi - I'm struggling to do the basic set-up of this - like a couple of other people did . In the 2a,2b,2c sections of Stephie's instructions, I don't know what an 'include' file is, or where they are . Is there a sub-folder for .inc files ?Do I need to get involved with these in order to do this now ...
- Mon Aug 27, 2012 8:42 pm
- Forum: Phono
- Topic: Switching of the phono inputs
- Replies: 11
- Views: 15127
Good ! - thanks for the links . Could be, after further thinking, it may have been one of my friends who tried what Thorsten had done with the relays, but didn't like the sound himself .. but then he is notoriously fickle ! Is it not possible to find a few examples of these relays NOS or loan from o...
- Mon Aug 27, 2012 5:41 pm
- Forum: Phono
- Topic: Switching of the phono inputs
- Replies: 11
- Views: 15127
- Wed Mar 07, 2012 6:41 pm
- Forum: Circuits
- Topic: GM70 into A2
- Replies: 26
- Views: 28685
ACF2 ?
My friend Nick ( G ) recently built 211 and 100TH ( Eimac ) amps with the J.Ross McDonald ACF-2 circuit as driver. http://jrossmacdonald.com/jrmpubs/040CathodeFollower.pdf That should work quite nicely, although you'd need something like 35-40mA in the right-hand section to handle the Miller cap of ...
- Tue Feb 14, 2012 6:40 pm
- Forum: Phono
- Topic: LCR riaa's
- Replies: 96
- Views: 134443
- Tue Feb 14, 2012 6:08 pm
- Forum: Phono
- Topic: LCR riaa's
- Replies: 96
- Views: 134443
Core !
Dave - Just gearing up finally to get these chokes into a rebuild of my current phono - planning the layout etc . I occurs to me I never asked you what the core materials were on these. Can you remember ? - they were the same as supplied to Andrew as discussed here . Have you got a new e-mail btw ? ...
- Mon Jun 27, 2011 9:13 pm
- Forum: Pb Place
- Topic: Partial Choke Loading of Cathode Follower
- Replies: 13
- Views: 17441
- Mon Feb 14, 2011 9:19 pm
- Forum: Transformers
- Topic: OT to drive Fostex T900A Tweeter
- Replies: 3
- Views: 5509
- Thu Feb 10, 2011 5:37 pm
- Forum: Attenuators
- Topic: Tell me about autoformer for 288-H
- Replies: 15
- Views: 15074
I'm sure you're right Dave - but as an interim solution, it has a lot of advantages in economy ( not least in postage from the US ) . Is the above plan feasible ? Otherwise I'm going to struggle to use those cores in the forseeable future . There's likely to be a fair bit of other expense coming up,...
- Wed Jan 19, 2011 10:09 pm
- Forum: Attenuators
- Topic: Tell me about autoformer for 288-H
- Replies: 15
- Views: 15074
Hey Dave The more I experiment with this horn system, the more I think I'm going to go tri-amp instead ....the direct connection to the driver seems best, and the filters need to be in the amps . I tried e-mailing you with the following suggestion but your Earthlink is 'bouncy' at the moment . :? He...
- Wed Nov 17, 2010 6:37 pm
- Forum: Phono
- Topic: Pentode Phono
- Replies: 24
- Views: 49942
- Tue Aug 31, 2010 6:25 pm
- Forum: Phono
- Topic: Audio Note M10
- Replies: 15
- Views: 34821
Phono
Andy This looks like an interesting unit. Seeing as how you are in the Leeds area, would you be able to come along to the next meet in Owston ( Doncaster ) or Eggborough ? There's some info on the AudioTalk forum - http://www.audio-talk.co.uk/phpBB2/viewtopic.php?t=2427&postdays=0&postorder=...
- Wed Sep 02, 2009 8:06 pm
- Forum: Attenuators
- Topic: Tell me about autoformer for 288-H
- Replies: 15
- Views: 15074
- Mon Aug 31, 2009 10:20 am
- Forum: Attenuators
- Topic: Tell me about autoformer for 288-H
- Replies: 15
- Views: 15074
- Mon Aug 17, 2009 6:34 pm
- Forum: Attenuators
- Topic: Tell me about autoformer for 288-H
- Replies: 15
- Views: 15074
- Sun Aug 16, 2009 9:24 am
- Forum: Attenuators
- Topic: Tell me about autoformer for 288-H
- Replies: 15
- Views: 15074
Service with a smile ...and a graph ! Very educational Dave . It takes a clever guy to explain something simple . I'd never appreciated how badly the crossover affects the driving impedance . Illustrates one big reason why it's 'better to do it in the front than in the back' as Harvey Rosenberg wou...
- Fri Aug 14, 2009 3:28 pm
- Forum: Attenuators
- Topic: Tell me about autoformer for 288-H
- Replies: 15
- Views: 15074
Hi Dave Well it looks quite clear that I need an autoformer for this. Interesting that your description neatly illustrates why the L-pad option to step-down gives a poor result - the source impedance is too high and comparable with the speaker . hence the dull , 'lacking sparkle' 'undynamic' warning...
- Mon Aug 10, 2009 5:26 pm
- Forum: Attenuators
- Topic: Tell me about autoformer for 288-H
- Replies: 15
- Views: 15074
Tell me about autoformer for 288-H
Hi Dave
To add to the queries I put to you in e-mail today ...
We should put up the discussion here about your thoughts on an autoformer design to step-down my new GPA 288-H drivers from 109db/W to 100-102dB approx to allow crossover to Aurum Cantus G3 ribbons.
Mark J
To add to the queries I put to you in e-mail today ...
We should put up the discussion here about your thoughts on an autoformer design to step-down my new GPA 288-H drivers from 109db/W to 100-102dB approx to allow crossover to Aurum Cantus G3 ribbons.
Mark J
- Fri May 15, 2009 9:56 am
- Forum: Phono
- Topic: LCR riaa phono preamp how does it sound???
- Replies: 2
- Views: 8296
Tom I heard several LCR phonos amongst 20+ units compared at ETF 2005 . All sounded great, the tone through the midrange sounding more natural . More recently I was able to do a detailed comparison of my own D3a/20kRIAA/D3a phono against a friend's LCR using the Thorsten 2002 circuit . I reckon I pi...
- Fri Apr 03, 2009 2:05 pm
- Forum: Phono
- Topic: Whats the secret of LCR RIAA´s?
- Replies: 16
- Views: 14583
I don't think low Z is the whole thing. having gone from 105k to 20k Rc RIAA on my own D3a/D3a unit, there were some improvements in transparency and dynamics , but hearing a good LCR is a proper 'step' change. There's a much better musical connection between the bass and midrange, better bass tone ...
- Mon Dec 15, 2008 12:54 pm
- Forum: Phono
- Topic: Phase and RIAA.
- Replies: 3
- Views: 7288
- Fri Mar 09, 2007 10:50 am
- Forum: c3
- Topic: be careful with those 75tl's....
- Replies: 9
- Views: 14268
75tl
Are they cylindrical anode then ?
Do they need to be driven in A2 ?
Nice looking tube. A bit challenging, I'll stick with easier things right now .
Mark
Do they need to be driven in A2 ?
Nice looking tube. A bit challenging, I'll stick with easier things right now .
Mark
- Mon Mar 05, 2007 1:50 pm
- Forum: c3
- Topic: be careful with those 75tl's....
- Replies: 9
- Views: 14268
Eimacs
Just a quick question from an outsider .. ( I sometimes end up copied on correspondance from Thom or Lynn ) Are you guys using the Eimacs mainly for power reasons or are they outstanding on tone & sound quality too ? If the latter then how do they compare against things I'm familiar with, like G...
- Thu Feb 15, 2007 11:30 am
- Forum: Phono
- Topic: IT loaded pentode to feed a LCR.
- Replies: 14
- Views: 20858
D3a
Andrew -
Depends where you're running the D3a and what the model assumes . You'll only get S=35 at max conditions remember .
Mark
Depends where you're running the D3a and what the model assumes . You'll only get S=35 at max conditions remember .
Mark
- Fri Feb 09, 2007 2:11 pm
- Forum: Phono
- Topic: IT loaded pentode to feed a LCR.
- Replies: 14
- Views: 20858
- Fri Jan 26, 2007 11:16 am
- Forum: Transformers
- Topic: SE amps to drive ES panels.
- Replies: 20
- Views: 30916
ESLs various
Hi Dave, Chris , Can concur with your experiences ( again ) from encounters with Quad 989s and various DIY ESL speakers at our recent Yorkshire meetings . On the DIY ESLs , we had difficulty driving one of the large pairs with anything other than a 300B PP amp with NFB . All other options, small SE ...
- Wed Jan 24, 2007 4:49 pm
- Forum: Phono
- Topic: MC stepups.
- Replies: 86
- Views: 102273
Loading
"Mark, I'd be tempted to try again with 1Meg on the grid and 100R on the primary. "
That's almost exactly what I did -
I compared conventional ; 10k on secondary ..
with-
120R on primary and 1 meg on secondary
MJ
That's almost exactly what I did -
I compared conventional ; 10k on secondary ..
with-
120R on primary and 1 meg on secondary
MJ
- Fri Jan 19, 2007 10:21 am
- Forum: Phono
- Topic: MC stepups.
- Replies: 86
- Views: 102273
More
Dave, I will google Lenz's law and try to get up to speed on your ideas ...but my concern was not the core , but overcoming capacitive loading and wire surface effects . We're dealing with such tiny voltages, that the currents are inevitably small and I wonder about reducing the current in the coils...
- Wed Jan 17, 2007 9:53 am
- Forum: Phono
- Topic: MC stepups.
- Replies: 86
- Views: 102273
Sims
Ok, guys, but what are you going to simulate ? I don't believe the differences will be just about gross frequency response . My suspicion is that with the load placed on the primary, and hence very low levels of current going into the transformer primary , you might see changes at low signal levels ...