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2PCS PSVANE 12AX7-S/12AU7-S/12AT7-S Valve Tube Replace EH ECC83/82/81 ECC803/2/1

Item description

12AX7-S

Packing List

  • 2*PSVANE 12AX7-S vacuum tube (matched pair)
The high-μ low-noise double three-pole small nine-pin tube is used for voltage amplification in the audio amplifier circuit, and the inverting drive push-pull amplification.

hot wire heating
UH 6.3 (parallel) 12.6 (string) V
IH 0.30 0.15 A

 
Limit value when zooming in class A1 (each side)
Anode voltage 330 V
Anode negative voltage -50 V
Positive gate voltage 0 V
Anode power dissipation 1.2 W
Hot wire cathode voltage (pk) ±180 V


 
Interpole capacitance
  No.1 No.2
Input capacitance 1.6 1.6
PF
Output capacitance 0.46 0.34 PF
Across Capacitance 1.7 1.7 PF

Electrostatic parameters
 
Ua 100 250 V
Ug -1 -2 V
Ia 0.5 1.2 mA
Gm 1.25 1.6 mA/V
μ 100 100
ri 80 62.5KΩ

 

12AU7-S

Packing List

  • 2*PSVANE 12AU7-S vacuum tube (matched pair)

Medium μ double three-pole small nine-pin tube, in the amplifier circuit for inverting drive push-pull amplification.

Hot wire voltage
UH 6.3 (parallel) 12.6 (string) V
IH 0.30 0.15 A

Limit value when zooming in class A1 (each side)
Anode voltage 300 V
Anode power dissipation 2.75 W
Maximum cathode current 20 mA
Gate voltage -50 V
Hot wire cathode voltage (pk) ±200 V
gate resistance
At self-bias: 1 MΩ
Fixed voltage: 0.25 MΩ


Interpole capacitance
 
  No.1 No.2
Input capacitance 1.6 1.6 PF
Output capacitance 0.4 0.32 PF
Across Capacitance 1.5 1.5 PF

Electrostatic parameters
Ua 100 250 V
Ug 0-8.5V
Ia 11.8 10.5 mA
Gm 3.1 2.2 mA/V
μ 20 17
ri(approx) 6.5 7.7 KΩ
Ug(approx) -11.8 -10.5 V
(when Ia=10μA)

 

12AT7-S

Packing List

 
  • 2*PSVANE 12AT7-S vacuum tube (matched pair)

The high μ double triode miniature nine-pin tube is used for voltage amplification and driving push-pull amplification in the amplifier circuit.

hot wire heating
UH 6.3 (parallel) 12.6 (string) V
IH 0.30 0.15 A
Limit value when zooming in class A1 (each side)
Anode voltage 300 V
Gate voltage -50 V
Anode power dissipation 2.5 W
Hot wire cathode voltage (pk) ±90 V
gate resistance
1 MΩ at self bias
0.25 MΩ at fixed bias

 
Interpole capacitance
Gate-Gate ............................... 0.005 PF
Anode-Anode ............................... 0.4 PF
Grid-Anode (Each Side) ................. 1.5 PF
Grid - Cathode, Filament (Each Side) ........ 2.2 PF
Anode-Cathode, Filament (Each Side) ........ 0.5 PF
Hot Wire - Cathode (Each Side) ................. 2.4 PF
Anode-cathode (each side) ................. 0.2 PF
Cathode - Filament, Grid (Each Side) ........ 4.6 PF
Anode - Wire, Grid (Each Side) ........ 1.8 PF
 

static parameters
Ua 100 250 V
Ia 3.7 10 mA
Gm 4 5.5 mA/V
Rk 270 200Ω
μ 60 60
ri(approx) 15 10.9 KΩ
Ug(approx) -5 -12 V
(when Ia=10μA)

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We are NOT responsible for any import tax or customs delay.
 
Most item will be shipped within 2 working days. For package less than 2KG, we use Airmail (10-25 days to most countries) and for package over than 2KG we use Expedited Service such as DHL, UPS and FEDEX (5-8 days to most countries). 

Free Return Within 30 Days

We provide  return within 30 days for all items you bought on eBay, full refund and return shipping will be provided.

1-year warranty is provided for all items(Excluding: 1. Man-made damage or misuse. 2. Audio accessories and consumables such as vacuum tubes).

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Douk Audio / Nobsound Studio was founded in 2013 in Shenzhen CHINA, we own several brands including Douk Audio / Nobsound / Little Bear etc.
 
As a professional audio company, we are dedicated to design and produce the best products at the lowest prices to make HiFi affordable.
 
We will spare no efforts to bring great products and service for customers and extremely to improve our customers’ listening experience.
Please don't hesitate to contact us if you have any questions or comments about our items. And our working time is from Monday to Friday between 9:00 am to 06:00 pm(Beijing Time), which means we can keep on-line at:
 
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