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Philips 7308 / E188CC - SQ label, phono grade

Philips 7308 / E188CC - SQ label, phono grade
Philips 7308 / E188CC - SQ label, phono gradePhilips 7308 / E188CC - SQ label, phono grade
Price: From $124.00 to $139.00
Manufacturer: Philips

Product Options

Test Results:
This 1970s Philips SQ E188CC / 7308 tube is a premium 6DJ8 /ECC88 type tube (VR8 & VR9 series). The SQ label indicates selection for special quality. The tube has the following characteristics:
  • creases on the top of the bottle
  • gray risers
  • round shield with two raised rectangular sections on opposite sides
  • large halo getter with wide support post
  • partial white label with the Philips logo and SQ insignia
  • Heerlen, Holland factory code etched in the glass
  • gold pins

This tube has been screened for gas, heater-cathode leakage, shorts, and excessive noise and microphonics on each triode section. It was tested at typical operating voltages on a laboratory grade Amplitrex AT1000 (manual setting, fixed bias mode). Learn more about our testing process here. See product options for current availability.

Noise and microphonics

This tube tests as "phono grade"--the quietest range for noise and microphonics--on our custom noise testing equipment. It is an excellent choice for sensitive applications such as microphone preamps, DA converters, and phono stages.

This tube is sold individually. It ships in a new white box with test results for current draw (mA) and transconductance (Gm) for each triode section. Photo is of a sample from the lot.

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Telefunken 6DJ8 / ECC88 - diamond imprint
Telefunken 6DJ8 / ECC88 - diamond imprint
Price: $119.00
Telefunken 6DJ8 / ECC88 - diamond imprint
This 1965 Telefunken 6DJ8 / ECC88 tube was made in Berlin, West Germany. The white label has the Telefunken logo and the diamond imprint is in the glass between the pins. Tube tests as new with balanced sections and phono grade noise levels.
TC Tubes specializes in precision testing and matching of vintage and new production vacuum tubes for guitar & bass players, audiophiles, and DIY tube audio enthusiasts. Our website features secure payment options and fast, convenient shipping around the world.

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