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Monday, March 7, 2016

211 Push Pull Output Transformer

Level 3 Custom Made Output Transformer – 211 Parallel Push Pull OPT

10K-PP, or 5K SE, is a very unique primary impedance. Such OPTs are usually very universal since a lot of tubes in the market can actually work with 5K primary impedance. Here goes another high end OPT made for 211 PPP, or 212 PP tube amplifier. 

This OPT is made slightly different compared to the 212 PPP output transformer, where we do not need to have that much air-gap (notice the highish primary inductance) in comparison to manage the medium high output power compared to the very high output power of 212 PPP tube amplifier.

Although the 212 PPP OPT outshines this 211 PPP OPT in terms of power, still, it packs a lot of power at hand to drive most speakers in the world.

P/s: This 211 push pull output transformer looked exactly the same like 212 pparallel push pull output transformer, therefore we skip the pictures for this post.

Technical Parameters
Tubes:               211 PPP, 212 PP, 211 PP (class A2)
Power:               200W at 20Hz
 
Core:                 Nanocrystalline / Amorphous Cut Core

Measured in circuit response
                          20Hz (-0.06dB) —1K Hz (0db) —20 KHz (-0.38dB) (8 Ohm, 1W)
                          Further results next to the FFT graph
Primary:            10 KΩ PP
Secondary:       0-4-8Ω
Primary DCR:    210.5Ω, 210.3, P-P,11℃
Secondary DCR:
                           0-4Ω, 0.18Ω
                           0-8Ω, 0.26Ω
Primary inductance:
                           206H, 212H, 20Hz, 5Vrms
Primary current: 290mA (maximum)
Efficiency:           0-4Ω >93%, 0-8Ω >94%。

Note: P1 and 8Ω are in phase.


In circuit measurement, testing conditions:
•    211 PP, 70mA per tube (4K Rp)
•    ~5Hz – 55 kHz -3dB

•    211 PP, parallel with 4K per tube to mimic 211 PPP, 70mA per tube/resistor (2K Rp)
•    ~3Hz – 70 kHz -3dB

 

We can't wait for the 212 PPP and 211 PPP owners to complete the amplifier and send us their creation pictures! 

Till then, have fun and build more amplifiers!

J&K Audio Design
3/7/2016

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Level 3: depends on type, size and complexity. Email us for details.

Iso-trans: link 1, link 2

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* Finished amplifiers, DACs, audio gadgets, upgrades and repairs - this is not our core business and we do it out of passion. We do not have fixed models, fixed price and we customize for each individuals. The sky is limit of creativity.

* Our product lines are always improving and increasing. If you do not see what you want, contact us!

* Please email for volume discounts, distributor and OEM pricing.

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