Tube help needed.

muncybob
muncybob Posts: 3,042
in 2 Channel Audio
I sent the below to a few members via PM, but in hindsight perhaps I should have potsed for greater visibility:

Need some advice/tube wisdom. I'm trying out some used preamps and the one that sounds decent and is in my price range is the Dynaco PAS-4 although I have yet to try out the phono. I actually think it's a very close second to the CJ PV2 that I am also auditioning, but that one is a bit out of our budget right now. The PAS-4 manual states it originally came with 12AX7(ECC83) line? and 6DJ8(6922) for I believe the phono stage? I opened up the unit and it has Tungsol 1207 and for phono Sylvania 34167, 82219, 6DJB and one that has no markings at all. If I were to keep this unit what would you suggest for tube changes, if any? From what I have read these preamps usually had a 6922 in it and suggested tube would have been 6N1P?
Yep, my name really is Bob.
Parasound HCA1500A(indoor sound) and HCA1000(outdoor sound), Dynaco PAS4, Denon DP1200 w/Shure V15 Type V and Jico SAS stylus, Marantz UD7007, Polk L600, Rythmik L12 sub.
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Comments

  • muncybob
    muncybob Posts: 3,042
    OK, I just read the manual a little more and now realize the line stage tubes are the 82219 and the unmarked tube, the other 4 are the phono.
    Yep, my name really is Bob.
    Parasound HCA1500A(indoor sound) and HCA1000(outdoor sound), Dynaco PAS4, Denon DP1200 w/Shure V15 Type V and Jico SAS stylus, Marantz UD7007, Polk L600, Rythmik L12 sub.
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  • marvda1
    marvda1 Posts: 4,901
    a lot of members like this pre.
    http://forum.polkaudio.com/discussion/167108/dared-tube-pre#latest
    Amplifiers: Norma IPA 140, MasterSound Compact 845, Ayre v6xe, Consonance Cyber 800
    Preamp: deHavilland Ultraverve 3
    Dac: Sonnet Morpheus 2, Musical Paradise mp-d2 mkIII
    Transport: Jay's Audio CDT2 mk2, Lumin U1 mini
    Speakers: Rosso Fiorentino Volterra II
    Speaker Cables: Crystal Clear Magnum Opus 2, Organic Audio Organic Reference 2
    Interconnects: Crystal Clear Magnum Opus 2, Argento Organic Reference 2, Argento Organic 2
    Power Cables: Argento Organic Reference, Synergistic Research Foundation 10 and 12 ga.
    Digital cables: Crystal Clear Magnum Opus 2 bnc, Tellurium Q aes, Silnote Audio Poseidon Signature 2 bnc
    Puritan PSM156
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  • mhardy6647
    mhardy6647 Posts: 33,802
    edited April 2015
    Heh -- I've never seen a PAS-4. Looks like it was Panor-era "Dynaco"? At any rate, nice looking piece of hardware; looks like it is chock-full of WIMA caps (not a bad thing at all). The only thing I see that I don't particularly care for is putting everything on one big PCB.

    Schematic at:
    http://dynacotubeaudio.forumotion.com/t1400-dynaco-pas-4-schematics-now-added-to-the-schematic-sticky-above (from Bob Latino)

    Mo' info at:
    http://www.audiokarma.org/forums/showthread.php?t=56175

    So -- I'm sorry, what's the question? Are you asking about 6DJ8/6922 subs, or whether a 6N1P can be back substituted for a 6922? If the latter, I think that the filament current draw of the 6N1P is higher than a 6922 (i.e., the latter can sub for the former, but not vice versa -- I think...).

    EDIT: Ok -- I registered at the Dynaco forum (which I'd never seen before today...) and downloaded the schematics. V1 and V4 are 12AX7; the other four tubes are 6922. The 12AX7s are used as the MM phono preamp tubes (just as in the earlier, "real" Dynaco PAS-2/PAS-3 preamps). Generically, I'd suggest either a pair of 5751s to replace the 12AX7s -- or (if there's enough gelt in the ol' piggybank) a pair of gen-u-ine Amperex or Telefunken ECC83s. I believe the 5751 has a little less gain (amplification factor) than a 12AX7, so they might not be the best choice for a phono preamp.

    For the 6922s... well, the canonical choice would be four Amperex 7308 tubes... but they, too, are 'spensive.
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  • muncybob
    muncybob Posts: 3,042
    I'm a complete newbie when it comes to tubes. Heck, I just learned the right way to take them out! I don't understand how you know what tubes will work in a piece. I listed what's in there now to see if anybody feels they could/should be swapped out for somethng else. At this price point($400) I'm not sure I could do much better on a tubed pre w/phono? I am a bit nervous about buying something this aged though.
    Yep, my name really is Bob.
    Parasound HCA1500A(indoor sound) and HCA1000(outdoor sound), Dynaco PAS4, Denon DP1200 w/Shure V15 Type V and Jico SAS stylus, Marantz UD7007, Polk L600, Rythmik L12 sub.
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  • marvda1
    marvda1 Posts: 4,901
    start with something new that a few members know about like this dared.
    http://www.audiocircle.com/index.php?topic=134018.msg1422250#msg1422250

    you can learn with this pre just add a phono pre.
    Amplifiers: Norma IPA 140, MasterSound Compact 845, Ayre v6xe, Consonance Cyber 800
    Preamp: deHavilland Ultraverve 3
    Dac: Sonnet Morpheus 2, Musical Paradise mp-d2 mkIII
    Transport: Jay's Audio CDT2 mk2, Lumin U1 mini
    Speakers: Rosso Fiorentino Volterra II
    Speaker Cables: Crystal Clear Magnum Opus 2, Organic Audio Organic Reference 2
    Interconnects: Crystal Clear Magnum Opus 2, Argento Organic Reference 2, Argento Organic 2
    Power Cables: Argento Organic Reference, Synergistic Research Foundation 10 and 12 ga.
    Digital cables: Crystal Clear Magnum Opus 2 bnc, Tellurium Q aes, Silnote Audio Poseidon Signature 2 bnc
    Puritan PSM156
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  • Faustin
    Faustin Posts: 1,149
    I have been very happy with my Dared pre. It was my first dive into tubes.
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  • voltz
    voltz Posts: 5,384
    I loved the time I spent using Paul's Dared preamp, I do think you would like it as your pre Bob! and most of them have a remote. and finding one at 300 is a nice price and leaves money for a phono amp maybe enough for a "Bugle 2" phono amp? and several here can help with the tubes for it.
    2 ch- Polk CRS+ * Vincent SA-31MK Preamp * Vincent Sp-331 Amp * Marantz SA8005 SACD * Project Xperience Classic TT * Sumiko Blue Point #2 MC cartridge

    HT - Polk 703's * NAD T-758 * Adcom 5503 * Oppo 103 * Samsung 60" series 8 LCD
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  • dkfreebird
    dkfreebird Posts: 1,186
    I have had the Dared for a few weeks now and love it.It is my first tube piece and you will not regret getting one.The list of different tubes you can use in it can be found here on the forum and then you can find what suits your taste from there.
    2 Channel
    Polk 1.2tl's Modded with dreadnought
    Musical Fidelity M6Si
    North Star Intenso Dac
    Auralic Aries Mini Streamer
    Oppo 103
    Pangea PC
    Wireworld Equinox 7 interconnects
    Wireworld Equinox 7 Speaker Cables and Jumpers

    Backups 2.3tl, Crs+ pin/blade with stands.Monitor 5 peerless,Monitor 4 peerless,Polk R200,McCormack Dna 0.5 Deluxe McCormack Dna 1,Dared Sl 2000A,Dayens Ampino Rogue Magnum 66 pre
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  • muncybob
    muncybob Posts: 3,042
    Decisions, decisions...this is worse than picking out paint colors when remodeling! I wish the dealer had one for me to try out. I guess I culdn't go wrong though as it seems from the above comments I could easily recover my $$ on a re-sell.
    Yep, my name really is Bob.
    Parasound HCA1500A(indoor sound) and HCA1000(outdoor sound), Dynaco PAS4, Denon DP1200 w/Shure V15 Type V and Jico SAS stylus, Marantz UD7007, Polk L600, Rythmik L12 sub.
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