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Dear Customer,Our Freeshipping is “Seller\'s Shipping Method”,Tracking number will be like “11457888274”or "  UA718888210YP"  ,this tracking number only can be tracked before it arrive the airport , and have no tracking information in your country.Do not choose this shipping method if you don\'t like the regular mail.  
 
Please choose “China Post Air mail” if you need international tracking number like this “RI254747030CN”,This number can provide a full tracking information. 
 
We provide Free China Post Air mail shipping method if your order price over $30. 
 
 
Compared to N tube,P tube soundMore delicate and beautiful, the air is better,Dive deeper bass,This machine can also use the gold peak of P channel field tube, after repeated comparison, but not recommended,Especially the IRF series,Turn on the voltage is too high, the details of the air are general, is absolutely classicGold seal MJ2955Good sound.
 
A channel for 39 yuan, 2 sets of 1 pieces of board, mirror image design
 
Board for the most high-end black double-sided board, better than the single panel has better conductive characteristics of more durable, the material is all TAOBO in the most high-end, all in order to continue the classic, in order to the best sound,Also some price estimate than the other shop.
 
 
HD1969 original machine is 6 tube structure, why should make 6 tube instead of 4???
 
1 Using 6 tube scheme, of which 2 electronic buffer tube filter, rushing sound, can avoid the switch machine poop-poop horn is a very good protection to the speaker, four pipe board, use long boot is definitely save a shock damage the speaker.
 
 
 
2& nbsp; the four tube HD1969, under normal circumstances, each channel minimum 30000UF capacitance that can be managed to ensure that no noise, because the AC ripple is very large, six tubes version, as long as the above 4700UF capacitor filter can do very quiet, details, level, background better. (such as electronic filtering Darlington, magnification of 1000, base is connected with the 220U capacitor and filtering effect quite in 22 million micro hair the filtering effect of 220X1000, so pipe 6 Effect and cost more than four pipe multi.
 
PCB size: 139MMX73MM
 
To use and simple test: (other than normal shop 1969, can be directly connected to the transformer)
The transformer voltage range: AC12V to AC28V 2 line if the DC input, can take 18 to 36V
 
 
 
The rest are high with new materials

 

Feedback capacitance has much effect on the sound, here with the ELNA brown god series capacitance.

RFSSeries high grade SilmicII brown or black: is Elna designed for sound design of the top audio capacitors, one of world advanced audio capacitor. Brass pins and extremely low distortion (third harmonic distortion than-120db), natural silk fiber medium.Tangent of loss angle / leakage current / resistance Small,Chain wave current, with excellent properties,Open field, sound sweet, mellow and powerful low frequency band, and the level of permeability good, rich richDepressive music taste,Enhance resistance design of acoustic oscillation, reduce Peak Peak  parts feel rough and intermediate frequency part of the sound quality. The capacitance is up to its name as the machine and the design of choice, durable, famous.

The machine can also use the caxa p-channel tube, after many contrasts has, but is not recommended,Especially the IRF series, Open the voltage is too high, details are generally air, is absolutely classicGold Peak MJ2955Good sound.

 

The capacitance of the actual audition feeling,Actual audition tone appears neutral, voices is exquisite moist, and Japan wang capacitance has a different style

MKT VISHAY capacitors, more delicate than WIMA and ERO, the details are better

The Japanese Shindengen 25A rectifier bridge, built a small ultra low, best sound

 

 


 

& have spent Test current, J point breaks, access to current digital table, adjust to 1-2 a

 

Packaging Details
  • Unit Type: piece
  • Package Weight: 0.5kg (1.10lb.)
  • Package Size: 15cm x 15cm x 5cm (5.91in x 5.91in x 1.97in)
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Packaging Details
  • Unit Type: piece
  • Package Weight: 0.5kg (1.10lb.)
  • Package Size: 15cm x 15cm x 5cm (5.91in x 5.91in x 1.97in)
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