GZ34; Philips Miniwatt; Brussels, Double D, 1962 NOS v33

Description

Here is a Philips Miniwatt GZ34 tube; early 1962 production, produced in the Philips factory in Brussels, Belgium. This is the famous  Double-D GZ34 version. According to many even better than the already outstanding Blackburn versions. The tube has zero dents plates and an f33 etch code. The tube is supplied in a generic white box.

The GZ34 is a full wave rectifier. The Philips GZ34 is famous for its contribution to the tonal quality of tube amplifiers and their extreme long life. They are highly regarded also for application in guitar amplifiers. 

These Philips made GZ34 tubes deliver superior performance compared to the Chinese and Russian new production.   

Test method

Anode current, gas and shorts tested with: AVO CT-160 (Dutch army tester), Utracer3+, AVO Valve Data Manual 23rd edition 1981, Philips 1532, RFT stabilised power supply and 2x Keithley 2700. Test condition: Ua (plate voltage) = 10,5 Volts.

Test results*

The measurement data below show that the GZ34 tube is in excellent condition and fulfil the factory requirements for a new tube. 

GZ34 V19

Ia (anode current): Gas test, Shorts test:

119 / 120 mA       OK

>  NOS

*The emission value for a new GZ34 valve at the used test conditions is: 120 Milliamperes (mA).  (Factory data sheet)

 

* Specified measurement data

Test results on other testing devices may supply different values. Just in case of mismatch of “standard” values of the different tube testers “standards”. My test results refer to tube data sheets provided by the original tube producers. (You’ll find them easily on the web.) And are obtained with the specified test equipment.

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Short description