Rectifier - Damper Diode ·Rectifier
Half-wave vacuum rectifier designed specifically for television horizontal-deflection damper service, with controlled heater warm-up for series-string receiver operation.
The 17BR3 (also co-designated as the 17BR3/17RK19) is a miniature half-wave vacuum rectifier designed specifically for use as a damper tube in the horizontal-deflection circuits of television receivers. It is engineered for operation in standard 525-line, 30-frame television systems. The 17BR3 is electrically identical to the 6BR3/6RK19 except for its heater ratings.
The 17BR3 is a miniature-type tube that requires a standard miniature 9-contact socket. Its physical outline corresponds to section 7D. The tube features an indirectly heated cathode with the following heater specifications:
| Parameter | Value |
|---|---|
| Heater Voltage (AC/DC) | 16.8 V |
| Heater Current | 0.45 A |
| Average Warm-up Time | 11 seconds |
Using the rated heater voltage of 16.8 V and heater current of 0.45 A, the nominal heater power consumption is calculated as 16.8 V * 0.45 A = 7.56 W.
The 17BR3 utilizes the 9CB pinout diagram. There are two documented variations regarding the connections for the heater and cathode terminals on pins 5 and 6. Designers must account for these differing descriptions when wiring the socket:
In one configuration, Pin 5 serves as a combined heater and cathode connection, leaving Pin 6 as an internal connection. In the alternative configuration, Pin 5 is dedicated solely to the heater, and Pin 6 serves as the cathode connection. Pins 1, 2, 3, 7, and 8 are reserved as internal connections in both configurations and should not be used for circuit connections.
The ratings for the 17BR3 are established under the Design-Maximum System for operation in a 525-line, 30-frame television receiver. These limits must not be exceeded under the worst-case operating conditions:
| Rating Parameter | Design-Maximum Value |
|---|---|
| Peak Inverse Plate Voltage | 5500 V |
| Peak Plate Current | 1200 mA |
| Average Plate Current | 200 mA |
| Plate Dissipation | 6.5 W |
| Peak Heater-Cathode Voltage (Heater Positive) | +300 V |
| Peak Heater-Cathode Voltage (Heater Negative) | -5500 V |
| Average Heater-Cathode Voltage (Heater Positive) | +100 V |
| Average Heater-Cathode Voltage (Heater Negative) | -900 V |
| Maximum Bulb Temperature (at hottest point) | 180 °C |
For the peak inverse plate voltage rating of 5500 V, the pulse duration must be strictly controlled and must not exceed 15% of a horizontal scanning cycle, or 10 microseconds.
The electrical performance of the 17BR3 is characterized by its internal tube voltage drop during conduction. Under typical instantaneous operating conditions, the tube exhibits the following characteristic:
This low voltage drop at high peak currents is essential for maintaining efficiency in television horizontal-deflection damper service.
The 17BR3 (17BR3/17RK19) is a specialized miniature half-wave vacuum rectifier optimized for damper service in television horizontal-deflection systems. Operating with a 16.8 V, 0.45 A heater, it provides robust high-voltage performance, including a peak inverse plate voltage rating of 5500 V and a peak plate current capability of 1200 mA. Its physical design utilizes a 9-pin miniature base (9CB pinout) and is capable of operating at bulb temperatures up to 180 °C.
Novar 9-contact
General specifications
Properties common to every published source and operating point.
Electrical assignments shared by every tube using this base designation.
No verified pinout is recorded for this base designation.
1 physical section, each with unique specifications.
Section 1
Same electrical ratings as 6BR3 except heater rating.
Source-dependent data
Each block preserves the test conditions and published values from one reference. Values from different sources are intentionally kept separate.
Data set 01
Published operating points and test conditions from this source.
Peak inverse plate voltage
5500 V
DamperService
Peak plate current
1200 mA
DamperService
Average plate current
200 mA
DamperService
Plate dissipation
6.5 W
DamperService
Tube voltage drop
19 V
PlateCurrent=250mA
Heater warm-up time
11 s
Average
Data set 02
Published operating points and test conditions from this source.
Peak Inverse Plate Voltage
5500 V
TVDamperService
Peak Plate Current
1.2 A
TVDamperService
DC Plate Current
200 mA
TVDamperService
Plate Dissipation
6.5 W
TVDamperService
Tube Voltage Drop
19 V
Ib=250mA DC
Heater-Cathode Capacitance
3 pF
Cathode-to-Plate-and-Heater Capacitance
10.5 pF
Plate-to-Cathode-and-Heater Capacitance
8.5 pF