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About ophool

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  1. Reading this I took pics to be (numbering from top down) 1 & 4 the EH 6CA7, 2 & 3 the Sovtek 5881/6L6WGC
  2. Not an assumption I would be prepared to make given the wide variety of valve types and pinouts using the octal arrangement. Using a pentode in place of a rectifier (or vice versa) might create more excitement than would be wanted. Even amongst the pentodes, checking the list of substitutes for the 6L6 shows many having varying pinouts which would therefore not be "drop in" replacements. From what I can find, a 5881 is a pentode that should have 7 connected pins as also is the 6L6, the EL34 is also a pentode having 7 connected pins so the missing one on your Mullards is fine. 6 pins on a 5881 does not compute.
  3. Hi, I would suggest the Jelco HS-25 as being a good match for the cartridge and arm. It is virtually equivalent to what I have my DL-110 mounted on and that has seen service on an SL1200 and several other arms also.
  4. I went from the DL-110 to the DL-103, initially using it with an MM phono stage and a SUT. The SUT was a Denon intended for use with the DL-103. While I liked the 103 I thought it a little coarse, particularly on classical music, so I purchased a DL-301 II and was happy with that for a number of years. I did replace the SUT with an active headamp and found that that improved the 103 significantly over the SUT. When I eventually sent the 301 for a rebuild, I had the late Duc fit one of his wooden bodies to the 103 and found that that plus a change to 1Kohm load really had the 103 singing. Most of the time these were used on a Michell Tecnoarm. Dependent on what arm you are using, the 301 with its higher compliance may be a better fit for you. On the Tecnoarm, prior to fitting the wooden body, I used a lead shim to add approximately 5gm extra mass with the 103, the 301 I ran as supplied, although I thought it a little better when loaded with around 212 Ohms. I have no experience of the 103R or other variants of the 103 and the 304 has quite a low output. Afterthought, the 103 series, including the R variant, are fairly low compliance and will usually sound better after playing one or two sides to warm up the suspension. This is regardless of any break-in from new.
  5. ASIO and USB are not mutually exclusive - see this panel from my system If you select the driver for a device that is not connected Foobar will usually timeout. A USB DAC driver will not drive your soundcard anymore than it will drive a scanner or printer. Why not connect the DAC by USB and save all this grief ?
  6. If the DAC is not connected by USB the computer does not "see" it and drivers are not required. (nor will they do anything) It is just the same as if you connected a CD player to the DAC by SP/DIF. If you see ASIO drivers for your soundcard in Foobar then select them, selection of Digital output will be in the Asus control panel or windows sound settings. If you cannot find Windows 10 ASIO drivers you may be able to use Windows 8 drivers in compatability mode.
  7. I would not say that a clamp or puck were necessary, but, IME the combination of one with various different mats may provide changes to your perception of various replay characteristics. They provided me an opportunity for trying various combinations until I found myself with a combination that satisfied my tastes. Their effect will also depend on what the deck is placed upon for support. On my modified P2 with GT platter and sub platter and SRM "silent base" I found the combination of a Funk Achromat and a Bren1 puck gave the result I was most satisfied with and I used that combination for many years. If the puck is placed gently on the record such that there is no shock load on the bearing there need be no concern on that account. You may find it interesting and instructive to experiment for yourself, I certainly did. I would also note that I do not follow RG's advice to allow the stylus to clean my records, not all his pronouncements need be read as gospel.
  8. Better known in pro audio circles perhaps, these are a life time investment. I bought an SM3 in the early nineties from studio 301 when they were moving from the city, it still provides sterling service in a friends system today with nothing needed in the way of service since I bought it. MM & MC inputs with high and low gain and sockets for load plugs. If remote volume is a real must have I would be checking the internal space very carefully as it looks like a motorised pot and control board could be fitted without much hacking. Really good buying here folks.
  9. As a reference please read the EML datasheet on the 274B rectifier tube and note the capacitance values there. This does not take into account any other variations there may be in your design which may possibly use a hybrid scheme (partial tube and SS rectification). For a completely tube rectified circuit pay particular attention to Note 2 at the bottom of the datasheet. I might be tempted to think that an EML rectifier tube could be a worthwhile upgrade provided the circuit values will not compromise it. I like the EML tubes in my Yamamoto amp.
  10. Not to put the dampeners on proceedings, but the little I do know about tube amp design suggests that increasing PSU capacitance in a tube rectified circuit is not to be undertaken lightly nor without complete understanding of the whole circuit and the effects of such change. Rectifier tubes can be overstressed by too much capacitance following them, chokes and hybrid rectification schemes can affect the desirable values too, but the take away is that increased PSU capacitance is not necessarily "a good thing" and that it needs a very competent valve tech to vary the values to any benefit. Otherwise, agree with Muon that changing out the AB resistors may lose some of the designed "flavour" - still have fun with it all anyway.
  11. The DX3Pro is also available through Amazon if that is your preference. A good headamp section with plenty of drive and a DAC that did not embarass itself when compared to an iFi iDSD Micro Black Label.
  12. Not sure what or whom you might consider to be "dodgy overseas" sellers. I recently purchased a Topping DX3Pro direct from these folk for an acquaintance and found them to be prompt and responsive. It sounded more than acceptable to me and I do own much more upmarket gear. Shure SRH 940 from StoreDJ will pair well with it, although I preferred my open back ATH-AD1000X which worked really well with it. I am partial to AT cans generally though. The Shure are very even handed if a little more prosaic.
  13. Would that be Cmoy perchance ? - those I have heard of.
  14. From the photos it would appear to be the DL-103 version.
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