Vacuum Tube - 12AX7LPS, Sovtek

Vacuum Tube - 12AX7LPS, Sovtek image 1
Vacuum Tube - 12AX7LPS, Sovtek image 2
Vacuum Tube - 12AX7LPS, Sovtek image 3
Customer image:<br/>"Valvestate vs100 "
Customer image:<br/>"The sovtek los sound great in the phase inverter on my rd45h diavlo! "
Customer image:<br/>"Here’s a photo of the sovtek 12ax7 LPS! Rd45H diavlo."
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Vacuum Tube - 12AX7LPS, Sovtek image 1Vacuum Tube - 12AX7LPS, Sovtek image 2Vacuum Tube - 12AX7LPS, Sovtek image 3
Customer Images:
Customer image: "Valvestate vs100 "Customer image: "The sovtek los sound great in the phase inverter on my rd45h diavlo! "Customer image: "Here’s a photo of the sovtek 12ax7 LPS! Rd45H diavlo."

Vacuum Tube - 12AX7LPS, Sovtek

In Stock

9 pin miniature preamp tube (Amplification Factor = 100). This Russian tube is full bodied and well balanced. It has a high gain with a very smooth presentation. In overdrive, it is not quite as defined as the 12AX7-S-JJ, but it offers more crunchy fizz. For more information about our 12AX7 tubes, see our tech corner article on 12AX7s.

Item ID:
RoHS Compliant
Product Measurements by Type
Amplification Factor94
Capacitance, Cathode to Heater5.0 nF
Capacitance, Grid to Cathode1.6 pF
Capacitance, Grid to Heater1.6 pF
Capacitance, Plate to Cathode0.46 pF
Capacitance, Plate to Heater0.46 pF
Capacitance, Plate to Plate600 pF
Capacitance, grid to plate1.7 pF
Grid Circuit Resistance (Rg), Fixed Bias1 MΩ
Grid Circuit Resistance (Rg), Self Bias2.2 MΩ
Grid Reverse Current0.2 μA
Heater Voltage6.0 - 6.6 V / 12.0 - 13.2 V
Heater to Cathode Voltage200 V
Plate Current (Ia)8 mA
Plate Dissipation (Wa)1.2 W
Plate Resistance (Ra)56 kΩ
Plate Voltage (Ua)330 V
Transconductance (S)1.7 mA/V
Packaging Information
Packaging Dimensions1 in. × 1 in. × 3 in.
Weight (Packaging)0.037 lbs.

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Specifications, Files, and Documents

PDF: Specification Sheet Specification Sheet595 KB

Questions and Answers

Click each question to see its answers.
Asked by Anonymous on March 9th, 2017.
Matt H
March 9th, 2017
These tubes have a balanced eq and are nice and smooth.
Asked by Anonymous on May 8th, 2017.
Matt H
May 10th, 2017
These tubes are not matched or balanced and this is service we do not offer.

Product Reviews

5.00 out of 5 based on 6 reviews
- July 29th, 2021
5 out of 5

The only tube I buy for the PI position. There are reviews out there claiming that these, current production Mullard, and the Gold Lion B759 are all the same tube. I own at least one of all three, and I can tell you that they are not. They do share the same basic bottle size and plate structure, but the similarities end there. The Gold Lion, albeit overpriced, is as good as advertised. In my Rockerverb and SLO, I couldn’t find a spot where I liked it. In my Vox, I couldn’t find a spot where I didn’t like it. The LPS is by far the best bang for the buck. You typically find them for less money than the Mullard reissue, and in my experience, they sound better and are less noisy. The Sovtek LPS is one of the best current production 12AX7’s available, regardless of price.

- September 5th, 2020
5 out of 5

There are brilliant in hybrid amplifiers, and made all the difference in my Micro Dark and Vox VT40+
The VT40+ came with a Ruby 12ax7 which was rather good, but I decided to switch it out for another to see if I could tell a difference, I tried JJ's Chinese, Tung Sol. The Tung Sol was on par with the Ruby, The JJ and Chinese sounded thinner, and more distorted they changed the sound and dynamics of the amp, it didn't sound like a Vox tone anymore, though it's a hybrid amp, it lost the thick, warm tube like sag it had, I could feel that difference when I plucked the strings, the loss made the amp sound more solid state, without depth.

- January 25th, 2020
5 out of 5

Great sounding tubes. Swapped out the preamp tubes on my Vox AXC30 (yes, with the blueback speakers) ;) Thanks y'all.

- July 21st, 2018
5 out of 5

The perfect current production tube for the phase inverter slot in my Peavey Classic 30 amp. It came highly recommended by trusted sources and did not disappoint. I'm on my third Sovtek 12AX7LPS as I change out the PI tube whenever I change the power tubes. Great tube at a great price.

- May 4th, 2017
5 out of 5

A+ ! Great Tubes ! I am using these in the V3 PI stage in both my Marshall Plexi Cloan Amps (Metro Builds) These tubes work great, Where others didn't. I will be buying these again just to have on hand.

- November 26th, 2014
5 out of 5

Currently using this as PI in both my Peavey Classic 50s and I'm very happy with it there. Full bodied lush tone, can really drive the output section well. Also have used it with some success in V2 (lead) position where it's quite good, but a little doesn't have enough "hair" for that position.