Description
Here is a pair of Tronal EL34 tubes; most likely a selection of RFT Germany. The RFT EL34 is known as an excellent sounding EL34 with o longs “life”. They deliver superior sonics compared to the Chinese and Russian new production EL34.
The pair has NOS specs. The measurement data below show the pair is matched. And fully in line with the specification for an EL34.
Note: my tubes are often not the cheapest.But is very hard to find better tubes !
Test results*
The measurement data below show that both tubes are matched.
| Valve 1
V64 |
Ia (plate current):
Transconductance (Gm): Gas test, Shorts test: |
106 mA
11,0 mA/V OK |
= NOS %
= NOS%
|
| Valve 2
V70 |
Ia (plate current):
Transconductance (Gm): Gas test, Shorts test: |
103 mA
10,9 mA/V OK |
= NOS %
= NOS%
|
Telefunken measuring values for new unused tubes:
- The rated emission value for a new EL34 is: 100 mA.
- The rated transconductance value for a new EL34 is: 11 mA/V .
For Telefunken specs info see last picture
Test condition & equipment:
Mutual transconductance, plate current, gas and shorts test equipment: AVO Mk IV (Dutch army tester) , AVO Valve Data Manual 23rd edition 1981, RFT stabilised mains, Utracer3+, Philips PE 4832, 2x Korad KA3005P programmable power supply, 2x Keithley 2700 and 2x Fluke 145. Test conditions: Ua (plate voltage) = 250 Volts, Us (screen voltage) = 265 Volts, Ug = -13,5 Volts and Uf = 6,3 V ± 3% (factory conditions). Please read our test page.
*Please read our test notes !
Summarized description
| Tube type | EL34 |
| Quantity of Tubes | One pair |
| Brand | Tronal |
| Manufactured in | Germany |
| Date code | EH |
| Plate Construction | stapled grey plate |
| Getter Construction | halo getter (see pictures) |
| Print Condition | excellent; see pictures |
| Box included | Original factory boxes; one El34 mark missing ! |
| Equivalent tubes: | 6CA7 |
| General test results | NOS specs |
* Specified measurement data
I give no garantee on measurements or different values measured on other tube testers or analysers. 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 measured with the specified test equipment.
Please read our test and delivery policy before buying !
