Mullard GZ34 Blackburn 7-Notch Rectifier Tube. Copper Lined Plates - Single Ring Getter - NEW in BOX. F32-B8J1 - Vintage 1958 OCT. This tube was made in Mullard's Blackburn, UK plant.. Tested on AT1000 w/Forward & Reverse Voltage Specs.
The 2 most important numbers to focus on is the FORWARD VOLTAGE DROP and BALANCE BETWEEN SIDE 1 & 2. Balance delta should be no greater than 5%. These are numbers that you will NEVER get with a vintage tube tester and are critical to the performance of your equipment.Here are the desired target numbers for a GZ34 / 5AR4. Forward Voltage Drop: 7 volts or Less = PERFECT. Reverse Voltage: Greater than 400 volts = OUTSTANDING. Forward Voltage Drop Side 1: 5.
Forward Voltage Drop Side 2: 5. Reverse Voltage Side 1: 434. Reverse Voltage Side 2: 434.
I Stand Behind Everything I Sell. I've been an Audiophile for over 50 years, 2 time National Champion in Car Audio and owned a chain of Car Stereo Stores... I have a massive collection of vacuum tubes specializing in mostly esoteric tubes but I have just about any tube you need. Just check the store for the listed inventory. If you have a request just send a message to NOVA.I stand behind everything I sell... My goal is to "Create a Positive Experience" for my customers. All tubes are tested with the Audiophile in mind for SHORTS, GAS, MUTUAL CONDUCTANCE, EMISSION and NOISE (large tube lots are not tested for noise). All my tubes are tested thoroughly on an Amplitrex AT1000... My backup tube testers are an AVO MKIV and another Amplitrex AT1000... I WILL NOT GUARANTEE THAT MY READINGS WILL MATCH YOUR READINGS.. Variations in Line Voltage and Test Equipment excludes any claims regarding matching test results on any equipment other than mine.. Please check with your country? We do not mark merchandise values below value or mark items as? - US and International government regulations prohibit such behavior.