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Posts posted by amped

  1. 3 hours ago, xoundmind said:

    can you explain the workings of the auto bias function? How hands on? 


    Here's the manual that came with the board. http://www.***.cz/files/AB-Q_ST-70_ST120_manual.pdf

    Once it's set to the desired bias voltage by the installer, there's no real hands on. Make sure they know what tubes you're using and clear it (voltage) with Bob.

    I was still checking my bias for a bit after installing but all 4 tubes were always the same (as designed). Hope this helps. 


    Bob was/ is a pleasure to deal with as well.

  2. Bob is right about the AB. I got it and had issues getting it installed. Everything was great prior to adding this. I got the PIO caps and the attenuator these are positives. I’m using KT120s, a center Brimar CV4003 and Bob's NOS RCA 5963’s on the outside. Amp sounds great and bias was always very close when I checked it monthly. It’s now spot on w/ the AB but that complicated it. The AB does have a delay so I got a Weber WS-1t  s/s rectifier. All in all, it’s a great sounding amp. 

  3. 50 minutes ago, 314carpenter said:

    I don't understand. Tell me if I am wrong here. So you don't have them set up where you can listen to them, and don't know how they sound, but you want to modify them? Why?

    I did say I'd listen to them first. 

    The terminal cups read 1989 so I'm just trying to know what's out there. IF I don't love what I hear, I can make an informed decision and it won't happen right away.

    It's just homework. 




  4. Hey 314, what mods did you do to your C2's?

    Just curious as I got a pair a few months ago. I have to get them to NY before I can listen and see what needs doing. I saw your SET12 mention but can't find anything beside the Audiogon posts. I don't think I can spend $$$ but maybe if I got some background I'd get pointed in the right direction. 

    BTW, I recapped my RB5's via Crites.


  5. On 8/16/2019 at 11:14 PM, Could sound better said:

    A Raytheon black plate 5814 is nice for the center position too!!

    kt120’s gave me a taller sound stage.

    Maybe I'll look for the 5814 down the road. The Brimar makes me very happy. KT120's have tight clearance w/ the Dynaco cage. 

    Until I have my Chorus 2's up and running I'm holding off on more tubes.


    Update- I did end up getting KT120's after someone confirmed cage clearance at Bob's dynaco forum. They sound great. I only have 3-4 hours on them so can't really judge but off the bat, they sound fuller than the TS 6550's. Definitely more on the bottom as well. 

  6. On 8/14/2019 at 10:40 PM, Could sound better said:


    find a balanced black plate d getter/foil cbs hytron for the center position. You'll like it👍

    For the side preamp position I'm running some black plate 12bh7's. they seem a little more engaging. Cv4003's are hands down excellent tubes. Cheers!!

    I see Bob L. says the 12bh7's have higher gain and they can be used. Have to look into why they should be. Not in much of a hurry to roll at the moment.


    Also tried "Hungarian" Amperex in the pre's. To me, no difference from the Sylvania's. Tried clear top D-getter RCA's sounded a bit too bright-  so went back to the Sylvania's...

    Yeah, that Brimar- WOW. Supposed to be better especially in the highs than Mullard. 



  7. Power:  TungSol 6550 reissues. (also got a good deal on a quad of KT88EH's- but I haven't tried those yet)

    Center:  (phase splitter?) Brimar NOS CV4003 /12AU7)

    Outers:  Sylvania 6189 /12AU7 NOS


    New-  Just doing the AutoBias mod so will use a Weber WS1-t   s/s rectifier that replaces the TS 5AR4

  8. 19 hours ago, mr clean said:

    Great job doing it yourself! Im not brave enough. Im happy for you and would love to hear it! Peace.

    Thanks! The instructions were great and all parts were separate and labeled and Bob was great on the phone. Also good pix of great examples on the web.



    I know of at least one in the Chicago area and his was connected to K-horns. I'm sure if you asked around at the above, you may find some one close.



  9. After 50+ years of listening to recorded music, I got a tube amp in February 2018. I had inherited a Thorens TT and some RB-5's and that was all it took.


    I started doing homework on a tube amp. I ended up getting a VTA ST-120 kit (you can get them turnkey as well).

    tubes4hifi.com is the seller. Bob Latino the kit builder has had a presence on the klipsch forum. Roy his partner designed the circuit over 30 years ago. It's based on the Dynaco ST70. The new versions have upgraded components. Bob is very responsive and generous with help before, during, and after. Roy is pretty helpful as well. They also have a forum with tons of info. After not doing any soldering for 25 years, the amp took me about 35-40 hours to build. I took my time and had no real issues- I was antsy and took a week before I plugged it in and turned it on. After doing so, I was bummed that I could've been listening to it. It sounds quite different to the Yamaha AVR it replaces. It's darker, faster, and more up front. Glad I did it!


    Bias takes all of 3 minutes every couple of months with a multimeter and a flat blade screwdriver. Bob says not to make a huge deal of worrying about it either. I'm having autibias put on it now as I want to keep the tube cage secured (kids and other animals) but otherwise, I'd have left it alone. Tubes aren't a worry either as they're very available. 


    I will have it playing through a pair of Chorus 2's before the end of summer. Just have to pick them up...


    I hope this doesn't sound too much like an ad. It's not meant to. The amp sounds great and it wasn't difficult to build (if you consider that route). I'm just a thrilled customer.


    Good luck!


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