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  1. #931
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    A project I've been working on recently.
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  2. #932

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    umm... umm... looks like there should be enough clues for me to know what this is... but I am failing. :-(
    all the best,
    mrh

  3. #933
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    I'll give you a hint. It would be extremely ironic to find one of these guys at your favorite equipment fishing hole.

  4. #934
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    The first board checked out fine, even into a reactive load, so I built a second one. Now to see if it works like the first.
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  5. #935

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    not a Quad Current Dumping Amplifier, is it?
    all the best,
    mrh

  6. #936
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    Give that man a ceegar...!

  7. #937

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    I finally reacted to the ironic comment in Post 933
    I was thinking real iron, you know, as in Fe and transformers and chokes; but you meant genuine O. Henry-style irony...

    :-)

    EDIT: Those are beautiful boards.
    all the best,
    mrh

  8. #938
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    Thanks! I'm more the tortoise than the hare when it comes to building something, I clean and check each component before it gets installed. I hope this will be a good sounding amp, I've blended three different modification philosophies along with a touch or two of mine. Very interesting design, opamp input stage, class A driver and class C current dump, eliminating all the current protection and lowering crossover notch distortion.

  9. #939

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    Hey those parts look familiar...hmmm. Ken is rebuilding and hotrodding my vintage Quad amp Mark and doing quite a fine job I must say.

  10. #940
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    Mark I and Mark II,
    I lucked into a swell find on CL, an HP3400A true RMS meter, HP334A distortion meter and B&K4017 sweep generator. Now once I get familiar with using these I can see how this amp measures. I left one of the channels stock until I was sure the modified one worked. That one only showed a small, level of ringing powering 8 ohms in parallel with 1uF cap. I then removed the last of the current limiting protective circuitry and started on the second channel. I finished it this morning and need to connect both channels to the power supply with the two 22,000uF caps.
    Audiophile disclaimer: I, the undersigned, fully realize that how an audio component measures bears little on how the component sounds. Meters don't have ears, rabbits don't smoke in Indianapolis and numbers should be crunched not heard.

  11. #941

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    Yeah, but if one can measure it, one might as well.
    I actually happen to have an HP RMS voltmeter; dunno the model number, but you can guess from whence it came :-)
    all the best,
    mrh

  12. #942

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    Here's a couple from inside the 1964 Fisher Philharmonic console I picked up. Having trouble removing the 6AQ8 tube from position V1 (has the open metal shield around it)- any suggestions? The metal cover around V6 came off without too much trouble and was able to access tube underneath, but this one is spot welded? to the chassis (the round shield) and I'm afraid to break the tube by rocking very hard on the pointed tip. TIA
    Travis
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  13. #943

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    Fingertips and gentle wiggling (vis-a-vis removing the 6AQ8).
    The pins may bend; if you don't have a pin straightner - well - tell your loved ones that they make great stocking stuffers!

    EDIT: Looks like the shield is riveted in place; it is essential for the tube to be shielded; it's the heart of the RF "front end" of the tuner - probably the RF amplifier, and oscillator and mixer, all in one.
    Last edited by mhardy6647; 09-30-2011 at 08:13 AM.
    all the best,
    mrh

  14. #944

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    holy schnizzle, this thread is over six and a half years old!

    This is my daily driver; a stereo SE 2A3 power amp based on the JE Labs/Angela "Simple 2A3" amp, ever so slightly modified to allow more flexibility in choice of driver (voltage amplifier) tubes. Right now it is using 6SN7s (although the first photo below shows 6EM7s). The outputs are rather show-off-y looking Sophia mesh plate "2A3" - actually more like 300B with 2.5V filaments as I understand it. They sound pretty good, and they look cool in an outrageous, "more is more" kind of way :-)

    The amp was not built by me but rather by an AKer of some repute. It is a fine sounding amplifier.






    There really is some slight differential in the brightness of the filaments of the two tubes. I don't know why is that :-P The effect is enhanced by the long exposure.

    all the best,
    mrh

  15. #945
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    Very nice, indeed!

  16. #946

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    Thank you sir. Truth be told... I should've built my own... I am fearless when it comes to the wiring, nuts and bolts, but it's just not pretty when I do wood or metal work :-( This one became available for a good price, with decent James output iron and very good quality passives and other hardware - I couldn't resist. I could never build one as nice looking left to my own devices...
    all the best,
    mrh

  17. #947

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    I love the reel to reel rack.
    engtaz

    I love how music can brighten up a bad day.

  18. #948

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    I am a sucker for R2Rs; I should use them more than I do, though.
    They're just enough work to spool up and run that I am usually too lazy to do it.
    all the best,
    mrh

  19. #949

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    Thank you for the info Mr. H-

    Picked up another old tube console today. Not even sure what brand it is, but does have a clean Garrard turntable slide out job in it.

  20. #950
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    We should start a thread where the topic is, "today is 'fire up your reel-to-reel/cassette' day!" Or, "today is listen to some George Harrison day!"

  21. #951

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    or just 'let's look at the innards of some old tape decks' day :-)

    Here's one - harman kardon cd391 (not the three-head cd491, unfortunately). From my favorite emporium; given away a while back. Took some candid photos before shipping it out...





    all the best,
    mrh

  22. #952

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    Quote Originally Posted by Kenneth Swauger View Post
    We should start a thread where the topic is, "today is 'fire up your reel-to-reel/cassette' day!" Or, "today is listen to some George Harrison day!"
    I like both those ideas Ken! I'll fire up my X-2000R and play some YES-Tales From Topographic Oceans, and the play All Things Must Pass on R2R. What about other people?

    Greg
    Taken from a recent Audioholics reply regarding "Club Polk" and Polk speakers:

    "I'm yet to hear a Polk speaker that merits more than a sentence and 60 seconds discussion."

    "Green leaves reveal the heart spoken Khatru"- Jon Anderson

    "Have A Little Faith! And Everything You'll Face, Will Jump From Out Right On Into Place! Yeah! Take A Little Time! And Everything You'll Find, Will Move From Gloom Right On Into Shine!"- Arthur Lee

  23. #953

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    Rainy day in Bahsten today; good day for hifi. I don't think I've listened to any R2R tapes upstairs in the living room since the Altec Duplexes went on line (just about a year ago); today's a good day for it. Have to see what I have in the way of software. No George Harrison fo' sho'; maybe some Beatles, though.
    all the best,
    mrh

  24. #954
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    Hello,
    This isn't, strictly speaking, an audio component, but it can be used to test them. Cleaning up a new (to me) HP 334A distortion analyzer. Beautiful construction, everything neat and in individual sub-compartments.
    Enjoy, Ken
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  25. #955

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    that is one beautifully clean machines I've seen here . Both inards and out are vey nice.

  26. #956

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    The vintage HP and Tektronix test and calibration equipment was beautifully made. I don't, unfortunately, have a photo of the guts of this old girl handy... but you can find 'em on the web and it's worth a peek.

    all the best,
    mrh

  27. #957

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    I have not opened mine but here is what the inside of my Exposure 3010S2 looks like.

    Quote Originally Posted by Timothy Smith View Post
    WOW!

    That's like working your way through Katie Perry in order to get to Rosie O'Donnell.

  28. #958

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    Guts of my new Bendix 6x5
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    Speakers: SDA-1C (most all the goodies)
    Preamp: Joule Electra LA-150 MKII SE
    Amp: Wright WPA 50-50 EAT KT88s
    Analog: Marantz TT-15S1 MBS Glider SL| Wright WPP100C Amperex BB 6er5 and 7316 & WPM-100 SUT
    Digital: Mac mini 2.3GHz dual-core i5 8g RAM 1.5 TB HDD Music Server Amarra (memory play) - USB - W4S DAC 2
    Cables: Mits S3 IC and Spk cables| PS Audio PCs

    Ofc: Wright WLA12 preamp: Anthem Amp 1: Pio Elite DV-79AVI: Airport Express: CAL Sigma II DAC: PA LS90 sonicaps and mills

  29. #959

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    I have a hot pic of a tube like that. My pic, Carl's tube on a Hagerman Coronet II I built for him.



    The Hagerman Coronet II phono stage I built.












    Carl asked for a top front mounted power switch. Wires were foil wrapped and run along the top of case.
    Last edited by SCompRacer; 10-28-2011 at 12:40 AM.
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  30. #960

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    oooh... a Cornet :-) very nice phono preamp...

    we're doing tube guts now, are we?
    let's see what's in the the photo bucket...

    all righty... howzabouta TJ/Sophia mesh plate "2A3" (really more of a 300B with a 2.5V filament, as I understand it). Sounds good, kind of disco-looking (huge globe envelope) but it does light up nicely compared to a 'real' 2A3. It looks like they're made from recycled toaster ovens...

    all the best,
    mrh

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