Brand new FU728F, one year warranty against tube quality.
Introduction:
1. EECTECH FU-728F electron tube is a coaxial structure cermet tetrode, forced air cooling, indirectly heated oxide cathode, anode dissipation power is 1.2kW
2. Mainly used for class A and B linear amplification, audio amplification, high frequency class C amplification, especially suitable for 1.6kW single sideband transmitter for final linear amplification.
Characteristic parameter
|
Hot wire voltage |
9V |
Hot wire current |
8.5～9A |
|
Transconductance |
≥14.3mA/V |
Static characteristics reference point |
-78.5V |
|
Air volume |
3m3/min |
cooling method |
Forced air cooling |
|
Interelectrode capacitance |
intput |
103pF |
|
|
Output |
13.3pF |
||
|
Cross road |
0.03pF |
||
|
amplification factor |
4.2 |
Installation location |
Vertical installation |
|
Maximum temperature of shell |
250oC |
maximum height |
132.5mm |
|
Maximum temperature of sealing |
250oC |
Maximum weight |
950g |
|
Maximum temperature of terminal |
250oC |
The maximum diameter |
86.5mm |
Extreme use data
|
Minimum filament heating time |
3min |
Maximum filament surge current |
12.5A |
|
Limit value at specified frequency（f=110MHz以下） |
|||
|
Allowable working deviation of heating wire voltage |
±5% |
Maximum anode DC voltage |
3kV |
|
Maximum two-bar DC voltage |
400V |
Anode dissipation power |
1.2kW |
|
Second grid dissipation power |
12W |
One grid dissipation power |
2W |
Typical working state (high frequency power amplification or modulation AB1 class)
|
DC anode voltage |
3kV |
DC two grid voltage |
350V |
|
One gate voltage |
-79V |
Anode dissipation power |
1.2kW |
|
Second grid dissipation power |
12W |
One grid dissipation power |
0 |
|
Anode DC current |
0.9A |
Two-tone output peak envelope power |
2.5kW |
|
Single tone output power |
1.8kW |
|
|
1kW FM broadcaster Class C
|
Anode voltage |
3kV |
Second gate voltage |
200V |
|
One gate voltage |
-55V |
Hot wire voltage |
9V |
|
Cathode current |
450mA |
Second gate current |
-2mA |
USD
EUR
GBP
