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Limberpine

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    New to Tubes

    in Talkin' Tubes

    Posted

    4 hours ago, MechEngVic said:

    Try bypassing the 3rd prong (ground) of the amp's cord with a cheater plug, see if that makes the hum go away. The ground loop may be between the amp and your A/C power.

    So I did ground the RCA to itself and hum in both speakers. I also took the RCAs off altogether, just speaker wire to amp and there is still a hum. 

     

    New to Tubes

    in Talkin' Tubes

    Posted

    2 hours ago, henry4841 said:

    You've got hum. Try shorting the inputs and see if the hum is in the amp itself. If it goes away with the inputs shorted the problem is elsewhere. 

    Thanks! Yes, I have to give a ton of Kudos to Holger at Erhard Audio. He just spent 20min with me on the phone walking through a  couple ways to chase down the issue, including shorting the Power amp, which when done, makes the noise LOUDER. : /

     

    I already had new power and rectifier tubes on the way, which he suggested changing them out will be the next step in seeing what's up.

     

    Any other words of advice on troubleshooting the problem?

    New to Tubes

    in Talkin' Tubes

    Posted

    1 hour ago, Les Lammers said:

     

    I have the same preamp and it's dead quiet on my Heresy 4's with both of my tube amps. There should be no 'feedback noise'. Did this ''noise' just start when you received the Aretha?

    So, there was a teensy hum when I was using the Schiit sys with the Will Vincent St-70 and was not audible during a song, only in between or when no music was on. but now that hum is WAY louder with the Aretha in all areas. 

    New to Tubes

    in Talkin' Tubes

    Posted

    5 hours ago, tube fanatic said:

    Please describe the sound you are hearing in more detail and if it is from both speakers.  Does it change with the setting of the volume control or input selector?  If it has a phono input, do you hear the sound with only the turntable connected and nothing else?

     

     

    Maynard

    I will see if I can post a short video. That might be the easiest way to hear it.

    New to Tubes

    in Talkin' Tubes

    Posted

    Woot!

     

    Got the new Erhard Aretha Pre......got it hooked up and ready to go.....then lots of noise in the La Scalas.....and what I mean about that is I heard a feedback noise in the speakers when there is no music playing and when there are quiet parts of music....is this to be expected? Or am I doing something incorrectly? 

     

    Here is the chain: laptop, hooked to Music Fidelity V-Dac, hooked to Aretha Pre amp, hooked to Will Vincent ST-70 hooked to the La Scals via 10awg silver coated copper wires bare end.

     

    The build quality of these units are great! Iooks rad too, and when I dont hear the "feedback" sound  it sounds lovely. 

     

    So, again new to tubes and want to know if this is what comes with the territory? 

     

    Thanks! 

    • Like 1

    K&K Audio- PP design monoblocks

    in Talkin' Tubes

    Posted

    21 minutes ago, Jeffrey D. Medwin said:

     

     

    $500 for two monoblocks is very little, almost nothing.  The price alone .....may be a red flag !!  Don't know. 

     

     I don't know where you and he live, but it could be $100-150 for each mono amp, for shipping, not including packing.  The external heatsink in the photo is a packing problem, for sure .

     

    I personally would not trust the average packing shop, to pack them for you well.

     

    Depending upon how heavy the chassis is,  and how he mounted all the components, there is a good chance that the units will be damaged in shipping.  Then you will have to get  them repaired.   

     

    A DIYer builds the unit with the mind-frame that it won't fall apart in his living room, or recreation room. A Manufacturer designs and builds so the unit will withstand shipping drops. 

     

    The seller is hesitant to ship, perhaps ......because he feels the unit, as built, won't safely get to you .

     

    I am just sharing some thoughts, you get to do what ever you want to do !

     

    Jeff 

    Jeff. This is VERY HELPFUL!

     

    I too thought this was a good deal at $500, so that is why I inquired.

     

    I asked him for dimensions and weight and he has gone silent, so I'm thinking it won't work out.

     

    If you pay FedEX to pack it, and insure it for the full value, they have done a great job for me, because it seems like they are ramping up efforts to cut down on claims.

     

    Thanks again for your help! And I would certainly be open to chatting about Monoblocks if you want. We can message back and forth about them. My plan was to budget to buy something in about a year, and then this came up, which looked like a sweet deal!

     

     

    K&K Audio- PP design monoblocks

    in Talkin' Tubes

    Posted

    54 minutes ago, Jeffrey D. Medwin said:

    This is a different deal than what you led "me" to believe. I thought you were buying these directly from Kevin at K and K.  There is no telling how well these are laid out, parts choices,  and actually built from scratch, by the average DIYer. 

     

    I would say there is far more risk involved, than I had originally envisioned.   

     

    A DIYer's build will vary widely, from what Kevin himself may do.   I would not be so inclined to buy these "blind " as I see more and more of whats going on in this thread.  

     

    So, I would like to alter my first post,  where I was encouraging you to act. 

     

    What were you going to pay for these, prior to shipping may we all know?  There may be other, safer alternatives to consider.

     

    Jeff Medwin

    Thanks! He is asking $500 for them and then whatever the cost of shipping would be. 

    K&K Audio- PP design monoblocks

    in Talkin' Tubes

    Posted

    He is hesitant to ship them due to size and weight, but im going to see what it costs and see if I can just have him bring them to FedEx for them to pack and ship them.

     

    Just so I dont go crazy in the red on these. What does everybody think an approximate value is on theses? 

     

     

    K&K Audio- PP design monoblocks

    in Talkin' Tubes

    Posted

    1 hour ago, Jeffrey D. Medwin said:

    Holey smokes !!

     

    I would suggest you buy them in a heartbeat.  I have no affiliation with Kevin of K and K .  

     

    I'll tell you this :  He is one of the better designers in tube audio.  He, like me, is getting older, and perhaps he is wanting to lighten up on units on his shelves !!!!   You will likely get much much more than your money's worth, in both build quality and in performance / and in value.

     

    The GU50s are a fine output tube !!   

     

    Kevin knows all about the Russian small signal tubes, and he runs them conservatively, so they will last !!

     

    MY mentor in audio runs one of his phono preamps, and it's a huge winner.  I have tons of respect for Kevin, and his work, his knowledge, whereas , usually I dismiss most audio products as being mid fi designed, and poorly implemented.  I just do not think that will be the case here. 

     

    You should consider yourself lucky to have these monoblocks made available....from K and K.  .  It will be something to keep using until you pass them on to your grandchildren.  Please let me know how this goes for you !!! 

     

    BTW : Leave the circuit alone, and do not try for more power !! It is all you will ever need, those seven Watts on a Klipsch La Scala speaker.

     

    Jeff Medwin 

    Very cool. It sounds like the owner of this built it themselves from Kevis 32b monoblock spec. 

     

    Yeah, I'm not going to try and make more power, givin the sensitivity of the speakers. 

     

     

    32B_monoblock_PP_amplifier.pdf

    K&K Audio- PP design monoblocks

    in Talkin' Tubes

    Posted

    Hi! 

     

    I came across a set of monoblocks from K&K Audio. Here is some info: 

     

    Two Monoblock vacuum tube amplifiers.

    Push pull design using transformer coupling between all stages
    (input, inter-stage, output).

    Estimated 7 watts per amplifier. Can be modified for more power.

    Lundahl interstage transformers

    RCA and XLR input connectors.

    Output transformer is a custom design rated at 90 watts.
    Power Supply transformer also a custom design of excellent quality.

    Tube complement (Russian NOS):
    Output: GU50
    Driver: 6Pi3C/6N3C (very similar to the 6L6GC)
    input: 6N6p / 6H6pi

    Driver stage operating point is set with current sources.
    Output stage operating point is set with current sinks.
    (Stable, reliable, easy to set.)

    Has a custom designed soft start circuit.
    Extra OP tube sockets and extra tubes.

     

    I'm wanting a set of monoblocks and this fits the budget, but I dont know a ton about what they are selling, so I wanted to gather some thoughts here. I would run these with my La Scalas and a Erhard Audio Pre and Phono. 

     

    Thanks for any knowledge you can drop on me here! 

    Gold lined LA Scalas- Washington-$5000

    in Alerts!

    Posted

    19 minutes ago, RandyH000 said:

    yep  , birch plywood that was slightly thicker , very strong cabs ,  heavier , these cabs did not resonate , and they were layered with fibreglass , plus aluminium trim -----

    On the resonating you mention. Is that a concern when listening to the La Scalas at low to medium sound levels? I've seen there are a couple places that sell braces to help stop the resonate, but wasn't sure if it really was an issue when not cranking them.

    Klipsch Chorus II - Denver, CO - $2000 ( 3 speakers for sale at that price)

    in Alerts!

    Posted

    Just talked to this guys and he is super nice. He really wants to sell these locally and I think he would work someone a better than $2k  deal if sold locally. His dad was a music teach and had all kinds of nice audio gear. We wants to sell all 3 Chorus ii speakers together.

     

    https://denver.craigslist.org/ele/d/westminster-klipsch-chorus-ii-speakers/7226221422.html

     

    Not affiliated, just trying to make sure these go to someone who will appreciate them!

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