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Old 11th September 2013, 07:40 AM   #111
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Oh man this thing can really sing now. Joni Mitchell is standing in front of me and singing live at my home. . Thank you Les. You are the man. lilc, credit goes to you as well for getting me here. Really appreciate the help from both of you.

And for everyone, I like to share this nice link I happened to came across. Plenty of good reading on electronics.

http://www.tubebooks.org/technical_books_online.htm

Last edited by coolzero; 11th September 2013 at 07:47 AM.
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Old 11th September 2013, 02:25 PM   #112
lilc is offline lilc  United States
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Kanishka,
I'm happy that things worked-out for you with this conversion and I'm glad that I was of some help to you, even if I was just the messenger. As you said, Les is the man. Besides creating the write-up that describes the work involved, I know that Les has helped numerous individuals personally (including myself) with the conversion. Thank you Kanishka for the kind words and thank you Les for everything, it's been a while since we've talked and I want you to know that my LesBox is working flawlessly and is still f***king awsome. Kanishka, good luck to you and I hope that you continue to enjoy your unit as much as I have mine, I absolutely agree with member troutmask123 when he commented "I can't imagine ever buying another phono pre".
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Old 13th September 2013, 06:34 PM   #113
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I understand that Jazz usually sound good through tube electronics, but rarely I heard such a speed and timing for rock/pop from a tube phono-pre before. It is truly an amazing experience to listen to this phono now.

Last edited by coolzero; 13th September 2013 at 06:45 PM.
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Old 17th September 2013, 04:46 PM   #114
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Les, I got the winged 12ax7 yesterday. As you rightly said, it really sings. Having very luscious mid tone is something I noticed immediately about this tube, compared to other 12AX7s I have. Also it mated well with other 12AX7s (specially with Mullard reissue) in second stage, which I haven't had much success before. Winged - Mullard combination had amazing detail but I felt the overall sound was slightly off PRAT. When I switched the secondary tube with NOS-RCA 12AU7, everything came back to live again. Never mind the little compromise in gain because end result was too good to compare.
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Old 17th September 2013, 08:26 PM   #115
Hi_Q is offline Hi_Q  England
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Kanishka, now that the pre is giving you the full works now, you will notice more the subtle differences that tube rolling gives. You will soon find the best combination that suits you but I think you already have :-D Enjoy!
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Old 19th September 2013, 02:06 PM   #116
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Les, I have a question about the winged 12ax7 you recommended.

In your 3 tube remake of the Yaqin 22B, would you use these in all three slots?
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Old 19th September 2013, 05:30 PM   #117
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Hi Steven, yes I use the winged =c= in all three positions, even in a Cathode Follower circuit one can hear differences between different valves - crazy.
I found Electro Harmonix also sound good here too.
Les
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Old 21st September 2013, 10:57 AM   #118
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Hi Les and everyone else! In the last few days I have ordered all items to change my MS22 according to your great manual. I was thinking about the same question like Steven and it seems to be the correct decision to order the same type :-)
BTW I choosed the RT080 7025 WA TAD HIGHGRADE tubes from TubeAmpDoctor. Maybe some of you know this.
I have no experience in doing myself hifi components. Could you explain in some easy words what does this third valve? You wrote it's working as a buffer, but I do not understand this. Language barrier could be also a reason ;-)
Theres only one questionmark on my list. I cannot find the 1M and 1k resistor with 0.125W. I only get it with 0.25W. Does this fact make any differences?
Thanks a lot for your time and help!

Sincerely Daniel
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Old 21st September 2013, 07:33 PM   #119
Hi_Q is offline Hi_Q  England
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Hi Daniel, a Buffer aka Cathode or Emitter Follower provides a lower impedance output for driving signals through cables to your main amp. In the MS22B this function is provided by the Transistors on each channel output. It is quite common to have a unity gain stage to act as an isolator even in op-amp circuits, usually called a non-inverting Buffer. In the MS22B the Buffer stage not only feeds the output cables but also the EQ circuitry which one would not expect it to do. The third valve in the conversion acts solely as a Buffer and has no connection with any of the EQ circuits. In the MS12 the same circuit as the MS22 is used but the output is fed to an inverting stage before a dedicated Buffer, crazy as it sounds, all signals going through the MS12 are made 180 degrees out of phase and worse still, the RIAA stage signals go through 2 stages of Buffering. Don't worry about the wattage rating of the resistors in question, the smallest of 1k resistors however make them easier to fit on the inputs to V1 and V2. Hope this helps - Les
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Old 23rd September 2013, 09:08 PM   #120
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Hi Les! Thank you for the detailed answer. But now there are two more questions coming up.
-What is the advantage when there's no connection to the EQ circuit after conversion?
-Is the quality of the v3 important when it's not connected to EQ as long it's a ECC83 like V1+2?

This morning my V3 and holder arrived from tube amp doctor
Tomorrow on my work I will drill the hole and then I hope in the next few days I have time to change all items.
I will give you all some feedback when it's finished

Daniel
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