I've been too busy and haven't visited for a while but a good Italian friend alerted me to the thread. Very nice build and hope you enjoy it!
I have many iterations of the circuit now, PM me if you ever want to discuss.
Cheers,
Naz
Search found 71 matches
- Fri Oct 24, 2014 5:18 am
- Forum: Sim City
- Topic: SET Driver comparison
- Replies: 1
- Views: 5013
SET Driver comparison
Guys, I recently got into a discussion (or argument depending on which way you look at it) on SET Asylum regarding which of these two circuits is best as a SET driver. I'm posting the ASC file here for ease of access and for anyone else who may be interested. I tried to set equivalent operating poin...
- Wed May 15, 2013 12:58 pm
- Forum: Phono
- Topic: Real World All Tube LCR Phono for MC Without SUT
- Replies: 58
- Views: 111077
Sorry Tony, It's been a long while since I posted and must have done something stupid in haste, happens as you get older :( I only have old schematics and will need to find the latest update but I'm happy to dig them up, scan and share with you. You are obviously much like me and always curious enou...
- Wed May 15, 2013 7:33 am
- Forum: Phono
- Topic: Real World All Tube LCR Phono for MC Without SUT
- Replies: 58
- Views: 111077
- Wed May 15, 2013 7:28 am
- Forum: Phono
- Topic: Real World All Tube LCR Phono for MC Without SUT
- Replies: 58
- Views: 111077
- Mon Jul 23, 2012 12:19 am
- Forum: Phono
- Topic: Real World All Tube LCR Phono for MC Without SUT
- Replies: 58
- Views: 111077
Thanks Maturin, I personally haven’t bothered with differential Phono so can’t comment on the real vs perceived benefits except to say that for me, the added cost and complication of differential in general for other applications has not been worthwhile. I’m sure that it can provide an advanta...
- Sun Feb 12, 2012 11:02 pm
- Forum: Phono
- Topic: Real World All Tube LCR Phono for MC Without SUT
- Replies: 58
- Views: 111077
- Wed Nov 02, 2011 10:48 pm
- Forum: Phono
- Topic: Real World All Tube LCR Phono for MC Without SUT
- Replies: 58
- Views: 111077
Much appreciated. I've spent more time on Phono than anything else in recent years because I love Vinyl and found that there is more to be gained at the front end than anywhere else. Besides, I have been extremely happy that I'm getting near enough as much as I can out of my PSE 845s, having spent y...
- Mon Oct 10, 2011 7:32 am
- Forum: Phono
- Topic: Real World All Tube LCR Phono for MC Without SUT
- Replies: 58
- Views: 111077
- Sat Jul 16, 2011 11:28 pm
- Forum: Phono
- Topic: Real World All Tube LCR Phono for MC Without SUT
- Replies: 58
- Views: 111077
Not sure whether it was Bravi or Fabio who suggested trying 6S15P in lieu of 6C45P but I tried a couple and must say I was impressed and worth reporting on. Specs are the same but the pair I tried sounded a tad different. Perhaps not as quiet but VERY little in it. They are slightly more open, airy ...
- Wed Jun 08, 2011 8:32 am
- Forum: Phono
- Topic: Real World All Tube LCR Phono for MC Without SUT
- Replies: 58
- Views: 111077
Hey again Fabio, Connecting the bottom tube heaters to ground as you suggest is fine but it would still concern me a little having floating heaters (DC wise) on the top tubes using this method. I haven't tried it although in theory it should be OK. This is where the 6H30P excels with a whopping 400V...
- Tue Jun 07, 2011 5:14 am
- Forum: Phono
- Topic: Real World All Tube LCR Phono for MC Without SUT
- Replies: 58
- Views: 111077
Hey Fabio, 12V heaters is a good but since you have 3 stages a better option is to run all top tube heaters in series or parallel and elevate to 100V or so (a simple resistor divider connected to the neg terminal will do) and run all bottom tubes from a separate heater supply tied to ground. R8, 15 ...
- Mon Jun 06, 2011 1:33 pm
- Forum: Phono
- Topic: Real World All Tube LCR Phono for MC Without SUT
- Replies: 58
- Views: 111077
Hi Fabio, Technically a 5687 will not be as good as a 6H30P in terms of ripple rejection and OP impedance. If you want to try it, instead of reducing the ref voltage, stick with the LM139 and increase the value of R2 (47K) to around 150K then fine tune to get approx 250V OP. You can use this method ...
- Thu Jun 02, 2011 8:45 am
- Forum: Phono
- Topic: Real World All Tube LCR Phono for MC Without SUT
- Replies: 58
- Views: 111077
About UX-280, I used two of them in the tube gain stage for my digital sources and got excellent performances, with a quite incredible sense of ambience That is exactly what I look for in a tube so they will be a great choice I'm be curious to know the reason you chose the 6H30 as many other tubes ...
- Wed Jun 01, 2011 2:48 pm
- Forum: Phono
- Topic: Real World All Tube LCR Phono for MC Without SUT
- Replies: 58
- Views: 111077
Hi Fabio, Glad to have you on board, I'm sure you won't be disappointed. To answer your questions, almost any rectifiers will do. I haven't had any specific experience with UX280s but start with those if you have them, their specs are fine and they do look pretty cool! Ultimately, the sound quality ...
- Sat May 07, 2011 12:58 am
- Forum: Phono
- Topic: Real World All Tube LCR Phono for MC Without SUT
- Replies: 58
- Views: 111077
Wow, nice trannie! The 6CA4 is more than up to the task and this is not affected by the size of the trannie anyway so only use something bigger if you particularly like it. One advantage of 720V ct is that you can go with choke input. Should be no need for a small input cap because it will increase ...
- Fri May 06, 2011 6:23 am
- Forum: Phono
- Topic: Real World All Tube LCR Phono for MC Without SUT
- Replies: 58
- Views: 111077
Hi Kevin, Good questions. The grid choke is a key feature of the design. To remove them would actually result in a ~2.5db cut at 20Hz, the response being flat down to 80Hz. It's impossible to cover every aspect in detail here, suffice it to say that if you were running sub(s) for extreme LF extensio...
- Wed May 04, 2011 6:31 am
- Forum: Phono
- Topic: Real World All Tube LCR Phono for MC Without SUT
- Replies: 58
- Views: 111077
Dave convinced me to design my own LCR and suggested scaling it up from 600 ohm to 7K3 to make it easier to drive. In the end I chose a slightly different impedance so that I could use standard value caps. I'm glad I heeded his advice because whilst I approached the task with trepidation the result ...
- Tue May 03, 2011 11:20 pm
- Forum: Phono
- Topic: Real World All Tube LCR Phono for MC Without SUT
- Replies: 58
- Views: 111077
No probs Kevin. To be honest I'm not sure of the exact specs for the power tranny I just used what I had, a toroid in my ref Phono and a standard EI for others. As long as it it can support the total current for the two channels with a healthy margin (100mA or so will do nicely) and provide the requ...
- Tue May 03, 2011 2:42 pm
- Forum: Phono
- Topic: Real World All Tube LCR Phono for MC Without SUT
- Replies: 58
- Views: 111077
Hey Kevin, My personal Ref Phono utilises a very complex hybrid regulator with tube rectification, SS voltage ref and error correction with tube OP so I developed this simpler two tube version for other Phonos I've built and modified which works extremely well, not as accurate but very quiet and ver...
- Sun Mar 06, 2011 10:49 pm
- Forum: Phono
- Topic: Real World All Tube LCR Phono for MC Without SUT
- Replies: 58
- Views: 111077
Hi Bravi, current through stage 1 is only about 7.5mA and a tad lower through 2. Stage 3 is running at about 9mA for lower OP impedance but could be taken as high as 15mA. It might appear strange running such low currents but linearity is not a problem with CCS, nor is noise an issue, even through t...
- Wed Feb 02, 2011 1:54 pm
- Forum: Phono
- Topic: Simple High Performance Tube MC Phono
- Replies: 1
- Views: 14865
Simple High Performance Tube MC Phono
Following on from my previous post on my Tube LCR MC Phono I am constantly asked for a simpler, cheaper version. Moreover what really prompted this post is that it bugs the hell out of me to constantly hear that no tube is quiet enough for MC amplification without the help of a SUT or Fet Cascode, w...
- Fri Jan 28, 2011 11:41 am
- Forum: Phono
- Topic: Real World All Tube LCR Phono for MC Without SUT
- Replies: 58
- Views: 111077
I've been asked several times now about simplifying the design by either substituting the top triodes with sand CCS or a simple Plate R. Here is a simple CCS version that measues well and I know works. Overall it sounds a tad thinner than triodes but subjectively quite detailed. Inreasing the idle c...
- Mon Dec 06, 2010 2:45 am
- Forum: Phono
- Topic: Real World All Tube LCR Phono for MC Without SUT
- Replies: 58
- Views: 111077
No probs Bravi, I finally got around to comparing sand CCS with tube. I never cease to be amazed how relatively minor differences from a technical perspective can change the sound so much. Subjectively a pair of Cascoded DN2540 Mosfets sounded a little more detailed than a 6922 on top of a 6922 but ...
- Thu Dec 02, 2010 6:10 am
- Forum: Phono
- Topic: Real World All Tube LCR Phono for MC Without SUT
- Replies: 58
- Views: 111077
Hi Bravi, First I'll bring you up to date with the SS CCS. Still haven't A/B'd SS vs tube but I have managed to get good results on another Phono using a generic feedback design. Had to increase idle current through the tubes to get some more body, used standard CCS on 1st stage and an R in series o...
- Fri Nov 12, 2010 2:22 am
- Forum: Phono
- Topic: Real World All Tube LCR Phono for MC Without SUT
- Replies: 58
- Views: 111077
Funny you should ask, I've not actually tried it in this design but always expected it to work fine with little difference (and it certainly Sims well). However, I recently tried it in a generic Phono design that half the world seems to use and got mixed results that I still haven't resolved to my s...
- Tue Apr 20, 2010 12:20 am
- Forum: Sim City
- Topic: Generic ASC files
- Replies: 11
- Views: 18206
- Sun Apr 04, 2010 12:59 pm
- Forum: Phono
- Topic: Shielding LCR's
- Replies: 14
- Views: 11597
- Sat Apr 03, 2010 1:01 pm
- Forum: Phono
- Topic: Real World All Tube LCR Phono for MC Without SUT
- Replies: 58
- Views: 111077
Thought so, that's why I asked. You'll never fix it, ask me how I know! My original design had the LCR after the first stage. It hummed like a bastard even though the components were in mu metal cans. The only way I could overcome it was to place the LCR after the second stage, picking up near 30db ...
- Sat Apr 03, 2010 12:31 am
- Forum: Phono
- Topic: Real World All Tube LCR Phono for MC Without SUT
- Replies: 58
- Views: 111077