Enclosure not stated
Tube 50hz crossover
- Category
- EQ / Filter· Tone Control and EQs
- Price
- see vendor
- Tags
- Tone Control and EQs
Schematic
The schematic is the archived file. Open it at Experimentalists Anonymous, or browse its folder.
Parts list 29 rows
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Check before you build · 1 value the reader of this schematic was not sure of
- 1 MEG at V2 grid: drawn as variable resistor, could be a front-panel control rather than a trimmer
| Ref | Value | Normalized | Type | Notes |
|---|---|---|---|---|
| Resistors 14 | ||||
| ×1 | 100 | 100 | V1 plate to supply A; read from the schematic by eye | |
| ×2 | 1 MEG | 1M | V1 and V2 (second section) grid return; read from the schematic by eye | |
| ×2 | 1000 | 1k | V1 and V2 (second section) cathode; read from the schematic by eye | |
| ×3 | 47k | 47k | two cathode resistors to ground (V1, V2 second section) and one series resistor after V1 cathode; read from the schematic by eye | |
| ×1 | 68k | 68k | 5%, filter feedback from output; read from the schematic by eye | |
| ×1 | 100k | 100k | 5%, filter series; read from the schematic by eye | |
| ×1 | 270k | 270k | 5%, filter series; read from the schematic by eye | |
| ×1 | 330k | 330k | filter series into V2 grid; read from the schematic by eye | |
| ×1 | 1.5 MEG | 1.5M | marked *: may be changed to 3.3 MEG for 6 dB overall gain; unity gain with 1.5 MEG; read from the schematic by eye | |
| ×1 | 100k | 100k | V2 first section plate to supply B; read from the schematic by eye | |
| ×1 | 1500 | 1.5k | V2 first section cathode; read from the schematic by eye | |
| ×1 | 4700 | 4.7k | power supply filter; read from the schematic by eye | |
| ×2 | 2200 | 2.2k | power supply filter (B+); read from the schematic by eye | |
| ×1 | 2200 | 2.2k | 1W, heater supply filter; read from the schematic by eye | |
| Capacitors 9 | ||||
| ×2 | 0.1uF | 100n | input coupling and V2 interstage coupling; read from the schematic by eye | |
| ×1 | 0.47uF | 470n | coupling after V1 cathode follower; read from the schematic by eye | |
| ×1 | 0.039uF | 39n | 5%, filter; read from the schematic by eye | |
| ×1 | 0.015uF | 15n | 5%, filter; read from the schematic by eye | |
| ×1 | 0.22uF | 220n | output coupling; read from the schematic by eye | |
| ×2 | 30uF | 30u | 350V electrolytic, B+ filter; read from the schematic by eye | |
| ×2 | 40uF | 40u | 350V electrolytic, B+ filter; read from the schematic by eye | |
| ×2 | 1000uF | 1m | 6V electrolytic, heater voltage doubler; read from the schematic by eye | |
| ×1 | 2000uF | 2m | 15V electrolytic, heater supply filter; read from the schematic by eye | |
| Diodes 1 | ||||
| ×2 | Diode | DIODE | no part number given; 500 mA 50 PIV, heater supply rectifiers; read from the schematic by eye | |
| Potentiometers 1 | ||||
| ×1 | 500k | 500k | Potentiometer | input level pot; no taper given; read from the schematic by eye |
| Trimmers 1 | ||||
| ×1 | 1 MEG | 1M | variable resistor from V2 grid to ground (wiper tied to ground end), filter adjustment; read from the schematic by eye | |
| Other 3 | ||||
| V1 | 12AX7 | 12AX7 | vacuum tube, half used; alternative 12AV6; read from the schematic by eye | |
| V2 | 12AX7 | 12AX7 | vacuum tube; read from the schematic by eye | |
| V3 | 6X4 | 6X4 | rectifier tube in the mains power supply; read from the schematic by eye | |