Description
A metal base GZ34 tube made in the Philips Miniwatt factory in Sittard, Netherlands.
Detailed description
Here is a of Philips Miniwatt metal base GZ34 tube; old production, produced in the Sittard factory in Holland. The tube bears date code: tv1 56G, which puts its production date in July 1956. The GZ34 is a full wave rectifier. The tube has two top D-getters and is produced in the fifties. The Philips metal base GZ34 is famous for its contribution to the tonal quality of tube amplifiers and their extreme long life.
The metal base Philips Miniwatt GZ34 is considered by many as the best sounding of all GZ34 tubes ever.
Test results
The measurement data below show that the GZ34 tubes are in excellent condition and fulfils the factory requirements for a new tube.
| GZ34
V38 |
Ia (anode current):
Gas test, Shorts test:
|
115 / 112 mA
OK
|
> NOS
|
Philips measuring values for new unused tubes:
- The rated emission value for a new GZ34 is: 120 mA.
- Rate value ± 10% is judged as NOS
Test conditions & equipment:
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 Volts.
Summarized description
| Tube type | GZ34 |
| Quantity of Tubes | One tube |
| Brand | Philips Miniwatt |
| Manufactured in | Sittard, Netherlands |
| Date code | tv1 56G (July 1956) |
| Plate Construction | Welded grey plate |
| Getter Construction | Double D getter |
| Print Condition | See pictures |
| Box included | Original factory box |
| Equivalent tubes: | 6CA7 |
| General test results | NOS |
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