Aiqin/Oldchen Tube Amps

Discussion in 'Tube Audio' started by bubba42, Jun 9, 2016.

  1. Poultrygeist

    Poultrygeist Addicted Member

    If more inputs for several devices are needed a cheap multi-input switch box is all you need.
     
  2. Austy

    Austy New Member

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    sorry to dredge the thread. wondering if you were still happy with your purchase? And did you have an opinion on any of these? shipping to Oz seems to be pretty variable among the companies.
    https://www.aliexpress.com/item/6P1...id=3de5015f-598b-446b-a08d-d52f7f206c14&tpp=1
    https://www.aliexpress.com/item/AIQ...id=403f6d3e-1bf3-4105-954e-6fa0b4f681a6&tpp=1
    https://www.aliexpress.com/item/AIQ...id=cb09e575-e0c1-442f-9aaf-a12d3397b235&tpp=1
    https://www.aliexpress.com/item/Dou...id=403f6d3e-1bf3-4105-954e-6fa0b4f681a6&tpp=1
    looks like the old chen is $355 aud, aiqin $339 (2x12w), silver luxury is $355 2x10w. all pretty similar prices.
     
    Last edited: Jan 2, 2018
  3. mjw21a

    mjw21a Super Member

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    2,371
    Location:
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    Last edited: Jan 2, 2018
  4. Austy

    Austy New Member

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    Thanks for the reply. Cant get that link to work. Ill flip through the thread and see which one you bought. Shame about that shipping price.
     
  5. mjw21a

    mjw21a Super Member

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    Location:
    Brisbane, Australia
    Your link second from the top is the one, though they used to list the Black "Luxury" edition as a colour. The main reason for it at the time was use of the Russian PIO's though I don't know if they're still using them. Either way it's an incredible amp if you've efficient and easy to drive speakers. I can get more useable volume from my 10WPC Oldchen SEP amp / Dayton USA PS220-8 (96.5db) combo than my 45WPC Oldchen K3 / Aurum Cantus F620 (89db) combo.

    I use these amps for everything from music to movies though te Oldchen K3 is my main system. It's fantastic for music though a bit weak when it comes to movies. The Oldchen SEP amp on the other hand has more punch so its better for movies..... I suspect that might be due to the DAC hooked up to each though. I'll have to try swapping it sometime to try sometime I guess.
     
  6. Austy

    Austy New Member

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    My speakers are 90s axis ls38s. 92.5db sensitivity. Hopefully ok?
     
  7. mjw21a

    mjw21a Super Member

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    Maybe ok, it's more complicated than I understand. Sensitivity only tells part of the story with respect to how easy to drive a pair of speakers can be.

    I recommend the Dayton USA PS220-8 drivers wholeheartedly if someone wants to DIY a pair of open baffles for a low to medium (40W) amp. Really easy to build and punch well above their cost in terms of the sound you get for the money (after a long break in). They're full range so no need to worry about crossovers or anything. Mine are in vintage ported enclosures from the 60's with no connectors. Just 11ga Western Electric tinned copper wire between the drivers and amp for less resistance.

    IMG_20171022_231456.jpg

    IMG_20171105_144235.jpg

    IMG_20171023_083627.jpg

    Look and sound great and the system actually outperforms my far more expensive Oldchen K3 / Aurum Cantus F620 in some areas. They're point source drivers though so off axis performance isn't great.
     
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  8. Austy

    Austy New Member

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    Beautiful. I have some old boxes maybe i could look into those drivers.
     
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  9. mjw21a

    mjw21a Super Member

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    2,371
    Location:
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    Worthwhile looking at. I replaced the chipboard back which kept flaking everywhere on mine with MDF and sealed it with super glue, bathroom sealant, wood screws and black oil based paint. The cabinet and porting isn't ideal sucking out bass at the low end so a sub is required. I understand that when done correctly there's plenty of bass. They're still better sounding than they've any right to be considering the cost, and I enjoy the vintage looks ;)

    IMG_20171021_152413.jpg

    IMG_20171021_135412.jpg
     
  10. No Money

    No Money AK Subscriber Subscriber

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    They aren't lightweight, that's for sure.
     
  11. mjw21a

    mjw21a Super Member

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    Location:
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    Weight tends to translate to higher shipping costs
     
  12. Austy

    Austy New Member

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    Pulled the trigger today on el34 silver deluxe. I asked to be triode as per a few other posters recommendations.
     
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  13. mjw21a

    mjw21a Super Member

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    I pimped my Oldchen SEP amp yesterday. What do you reckon. Probably needs another coat of stain on the wood.

    IMG_20180108_160013.jpg IMG_20180108_160026.jpg
     
  14. bubba42

    bubba42 Active Member

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    I got my amp almost 2 years ago and didn't specify a connection. At that time the ad said:
    "Output power: Ultra-linear connection 10Wx2(default and recommand mode by manufacturer), triode connection 10Wx2, standard connection 12Wx2, tell us if you want to change the default connection mode."

    I wonder what I got, 10W? What does that mean? Is that a pentode connection?
     
  15. mjw21a

    mjw21a Super Member

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    Mines the default.... So 12W Pentode I guess. Wish I had it wired for triode now. Ah well.

    It sounds very very nice either way though.
     
  16. bubba42

    bubba42 Active Member

    Messages:
    280
    mjw21a, I am not sure if you/we got 12W. Didn't you buy yours ~1.5 yrs ago? How do you read the above (listing both a default and a standard)? It seems then that a 10W connection was the default? What is that?

    What is the difference in connections?
     
  17. mjw21a

    mjw21a Super Member

    Messages:
    2,371
    Location:
    Brisbane, Australia
    No idea really. It was supposed to have Russian PIO's also though when I opened it up recently they were definitely not PIO's so really I've no idea about its configuration apart from that it's single ended rather than push/pull. Still, sound is better than it has any right to for the cost. After painting the transformers bronze and fitting wood ends (using liquid nails) it looks as good as it sounds.
     
  18. FlaCharlie

    FlaCharlie Active Member

    Messages:
    317
    Location:
    Gainesville, FL
    It's pretty easy to triode strap a pentode. Instead of sending power to the screen grid (G2) from a separate wire from the power supply you connect G2 to the plate with a resistor, typically 100 ohms or so, the value isn't critical. I'd probably go with a 1 watt. The wire that was originally supplying voltage to G2 is just taped off or covered with shrink wrap to prevent it from shorting out on anything. Depending on the type of tube, triode strapping will cut the power output at least in half. I'm not sure if these Chinese amps use negative feedback and I don't how it would affect that. Many people prefer the sound of triode strapped pentodes over operating them in normal pentode mode. The times I've tried it I didn't notice all that much difference. I much prefer using real triodes like the 6A5G, which is what I have in my current SET.

    You should probably do some additional research on the subject. It would also help to have a schematic of the amp. Good luck with that.
     

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