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Heifetz

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About Heifetz

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    Melbourne
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    Australia

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  1. Last year I fell in love with an 'all' tube preamp that then quickly started humming madly - so loud. I posted a topic asking for ideas to solve the problem. There was so disappointment and frustration, tried many ideas to no avail and I finally gave up trying to solve the problem. I let it sit for about 8 months and continued to use my other nice and trusty preamp. . Last week my capacitor blew/leaked and red plated an EL34 in my power amp and my tech replaced all four with Jensen Copper PIO and that has proven very successful. I called my tech to tell him I was happy and he asked whether I had ever solved the hum problem with my other pre amp. He said he wanted to try a different approach to solving there problem. I said, "why not?". I left the pre with him for 3 hours and he changed the 'heater' from DC to AC. I picked it up, set it up at home and turned on the system. Voila! No Hum!! I am so happy. Wonderful full, rich sound. Just love it now. I don't understand why it has worked - but it has. May be someone can explain why it has worked. Regards, Bob
  2. @Ittaku I am reading a lot about the Mundorf Supreme Silver Gold Oil capacitor, It seems to have a long burn in time and when it suits the application and some systems it will sounding amazing with very happy owners. However, it does seem to have a less of a consensus amongst people who have tried them that it did not suit their system. Bob
  3. Thank you All for your comments and suggestions. I really appreciate it. I am also considering the Mundorf Supreme Silver Gold Oil capacitor 0.10uF 1000V , Has anyone experienced the Mundorf's? The Dielectric is Polypropylene. There own Mundorf description says, "These unique characteristics offer a capacitor type of equally unique musicality: finely nuanced and lively shining acoustic colours, which combine into a breathtaking, beautiful, live-like music experience with the utmost precision, presence and three-dimensional plasticity." Does the higher voltage rating improve/change the sound compared to the 630Vdc of the Jensen that I am replacing? Thc so much, Bob
  4. Hi @aussievintage The amp is at least 12 years old. These Jensen caps are the older types that are a little unreliable - as I have discovered. Bob
  5. @Ittaku @MattyW @Muon N' Thank you for replying with your comments and advice. Yes, the heater in the EL34 was red hot because the cap was failing. So I now need to replace all 4 or just the one cap of the same. The current caps are 0.1 uF value. Does that mean I should replace the with exact same value or as Muon N' suggested that 0.47uF Dueland JAM is a possible consideration? I would like a cap that offers balance across all frequencies, control, richness and transparency. I think my choices are: 1. 0.1uF 600Vdc Jupiter Copper Foil, Paper & Wax Capacitor £46.32 How will this compare to to a 630Vdc cap? 2. Jensen Capacitor 0.10uF 630Vdc Copper Foil Ceramic Case £57.31 How does the ceramic case influence the sound? 3. 0.1uF 630Vdc Duelund Jam Tinned Copper Foil Paper in Oil Capacitor £34.23 Any further thoughts on these three? Thanks so much, Bob
  6. Greetings, I have 4 older types Jensen 0.1uF 630V Copper Foil, PIO, Aluminium can in my power amp and one of them needs replacing. I have a choice of replacing it with one of the same. However, my audio tech says that it is not as reliable as the newer ones. Therefore, I have a choice to make. 1. Replace the one with the same 0.1uF 630V Jensen Copper Foil, PIO, Aluminium can., 2. Change all 4 to a newer and more reliable cap - Jensen Capacitor 0.10uF 630Vdc Copper Foil Ceramic Case If I change all 4, then it will change the sound and be more expensive. My audio tech says that the newer Jensen cap that would be closest in sound to what I have, would be the Jensen Capacitor 0.10uF 630Vdc Copper Foil Ceramic Case Doe anyone have a comment/advice about this choice I can make or any other consideration? It would be most helpful to me. Thank you, Bob
  7. Hello, This is a picture of my power amp with EL34's. My Front Right EL34 looks to bright. Unlike the others, It seems to glow all the way through the centre of the tube. My previous tube did the same in this F/R position and I changed it a couple of days ago to this current pictured tube (and biased too). Can anyone advise me? Or am I stressing over nothing? Thx so much, Bob
  8. Hi Andy, I've been overseas for a few weeks and just returned last night, so haven't been following SN. I won't have any time to do much listening or comparing over the next period. Need to 'reset' myself first Bob
  9. Item: Thorens 160 with heavy Jarrah Plinth/tone arm Location: Burwood East Price: $700 Item Condition: excellent. Reason for selling: nlr Payment Method: Pickup - Cash, Paypal, COD Only Extra Info: I had this up for sale a few weeks ago together with a separate power supply/speed changer. I have decided to separate into two separate sales. I bought this from German Ebay Store Art-and-Sound except for the plinth. I wanted a heavier plinth than what they offered so had the one in the picture made from Jarrah. The 'engine' was professionally restored by Art-and-Sound and still in perfect condition. You can see the excellent workmanship from the photos below. This Thorens 160 also has the aluminium pulley that is an upgrade to the original (included by Art-and-Sound. I have the original pulley which I will include if you like. Mat also included. The Thorens tonearm is terminated but no cartridge included. This Thorens 160 sings beautifully and provided me many hours of musical experiences. Pictures:
  10. Item: Power Supply with switch for a 33/45 speed Location: Burwood East Price: $220 Item Condition: excellent Reason for selling: NLR Payment Method: cash or bank deposit Extra Info: I used this unit to switch between 33 and 45 for my Thorens 160 so that I didn't need to use the Thorens 33.45 switch at all. The unit consists: 45 speed: mains AC to isolation transformer (made from a company in S.Melboutrne) to Step down transformer to Frequency inverter to Step up transformer to switch to output 33 speed: mains AC to isolation transformer to the switch then to the out output. Pictures:
  11. Item: Power Supply with switch for a 33/45 speed Location: Burwood East Price: $250 Item Condition: excellent Reason for selling: NLR Payment Method: cash or bank deposit Extra Info: I used this unit to switch between 33 and 45 for my Thorens 160 so that I didn't need to use the Thorens 33.45 switch at all. The unit consists: 45 speed: mains AC to isolation transformer (made from a company in S.Melboutrne) to Step down transformer to Frequency inverter to Step up transformer to switch to output 33 speed: mains AC to isolation transformer to the switch then to the out output. Pictures:
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