Home / scandal stars dating / Dating rca vacuum tubes

Dating rca vacuum tubes

The average voltage spike from each tube's samples was then calculated and used for comparison.A custom 12AX7 switching box was constructed to allow for a quick switch comparison of six tubes at a time while plugged into the V1 socket of a Marshall JCM800 2203 guitar amplifier.

dating rca vacuum tubes-9dating rca vacuum tubes-81

A shielded cable was constructed to plug into the amplifier's V1 socket and transfer its pin 1, 2, 3, 6, 7 and 8 connections to one tube socket at a time in the switching box.

Each tube sample was tested in the same (Fender black face style) preamp circuit as shown in the schematic below with bass and treble set to their maximum.

A frequency generator was used to measure voltage gain and plot the frequency response from 10 Hz to 18,000 Hz.

Also included in this comparison are direct substitutes for the 12AX7 including: ECC83, ECC803, 70.

The 12AX7 is a 9-pin miniature, high-mu, twin triode. The 9-pin miniature part tells us what kind of socket the tube plugs into.

640 comments

  1. What It’s Worth Vacuum tubes worth more than the tube tester. BY Steve Johnson [email protected]’s Note This is the second in our on-going What It’s Worth series that keeps you up to date on what’s hot in Antique Technology.

  2. The red print on the glass has the RCA. and new production vacuum tubes for. vintage vacuum tubes.

  3. KCA NOS Tubes. Audio tubes for guitar amplifiers and audiophile equipment. 12ax7, 6v6gt, EL84, EL34, 5751, 12AY7, 6L6GC, 5AR4, GZ34, 5U4GB, Mullard Ecc83, RCA 12AX7, GE 12AY7, RCA 6L6GC, JAN Philips 7581A, RCA 6V6GT Blackplates.

  4. Reviews vacuum tubes amplifiers. A lot of questions have been asked about when a tube is made, so here you go, a quick guide on how to decipher the date codes.

  5. AX7 Comparison of Current Made Tubes. RCA and Sylvania first introduced. Vacuum Tube Accessories Vacuum Tube Amplifier Sets Vacuum Tubes Yellow.

  6. British made Mullard 6021 / 6021W Dual Triode tubes. Excellent UK made quality at an affordable price! Just $39.99

Leave a Reply

Your email address will not be published. Required fields are marked *

*