High Voltage Power Supply for the 807 Linear Amplifier
I built this power supply unit in the smallest case I had available for the job which was originally an ATU for a Clansman Transceiver, it is very strong and measures only 9x6x6"
It's purpose is to supply all the required voltages for the 2 x 807 Linear Amplifier also in this section of the website but can of course be used to power many different projects needing such supply lines.
The heart of the PSU is the mains transformer which was originally used in a 60 watt Pye F60 base station transmitter (Part No AL21072) and as you can see from the picture below it does not leave much room for the other components!
Due to the size of the power supply it was not possible to use chokes in the high voltage sections.
I built this power supply unit in the smallest case I had available for the job which was originally an ATU for a Clansman Transceiver, it is very strong and measures only 9x6x6"
It's purpose is to supply all the required voltages for the 2 x 807 Linear Amplifier also in this section of the website but can of course be used to power many different projects needing such supply lines.
The heart of the PSU is the mains transformer which was originally used in a 60 watt Pye F60 base station transmitter (Part No AL21072) and as you can see from the picture below it does not leave much room for the other components!
Due to the size of the power supply it was not possible to use chokes in the high voltage sections.
Main HV board fitted
Fortunately there is a cavity in the front panel making the transformer a snug fit, the panel also accommodates the mains switch, neon etc
Two internal neon indicators are connected to the Anode and Screen Grid HV supplies which apart from confirming that the supplies are operational are a warning to keep fingers well away!
The Finished Unit
The output voltages of the PSU are as follows............
Anode HT supply +720v
Screen HT Supply +460v
Grid Bias Supply -72v
AC Heater Supply 6.3v
NB, The voltages shown are those obtained when using the 230v primary tap on the Pye mains transformer (pin No 2), this is not an issue as the unit will not be in 24 hour service as originally used and I have been running it on test for a few weeks now with no overheating issues. You need to check this for yourself having regard to you're local mains supply voltage.
Anode HT supply +720v
Screen HT Supply +460v
Grid Bias Supply -72v
AC Heater Supply 6.3v
NB, The voltages shown are those obtained when using the 230v primary tap on the Pye mains transformer (pin No 2), this is not an issue as the unit will not be in 24 hour service as originally used and I have been running it on test for a few weeks now with no overheating issues. You need to check this for yourself having regard to you're local mains supply voltage.
Circuit Diagram
7 Parts List
R1 270k
R3-R6 100k, 5w
R7 1k, 2w
R8 100k, 5w
R10 330k
R11 470k
C1-C8 4n7, 2kv, disc cer
C13-15 47mfd, 450v elec
C11-12 220mfd, 450v elec
C16 1000mfd, 100v elec
C18 4n7, 250v, disc cer
C19/C20 4n7, 2kv, disc cer
D1-D8 1N5408 Diode or equiv
D9 BY164 Bridge Rectifier or equiv
N1-N3 Neon Indicators
T1 PYE AL21072 Mains Transformer
FS1 2A
FS2 315mAT
FS3 200mA
SW1 Double Pole Mains Switch
NB, If you have suitable LF chokes available and the space in which to fit them they should of course be employed in the HV lines together with additional smoothing capacitors.
R1 270k
R3-R6 100k, 5w
R7 1k, 2w
R8 100k, 5w
R10 330k
R11 470k
C1-C8 4n7, 2kv, disc cer
C13-15 47mfd, 450v elec
C11-12 220mfd, 450v elec
C16 1000mfd, 100v elec
C18 4n7, 250v, disc cer
C19/C20 4n7, 2kv, disc cer
D1-D8 1N5408 Diode or equiv
D9 BY164 Bridge Rectifier or equiv
N1-N3 Neon Indicators
T1 PYE AL21072 Mains Transformer
FS1 2A
FS2 315mAT
FS3 200mA
SW1 Double Pole Mains Switch
NB, If you have suitable LF chokes available and the space in which to fit them they should of course be employed in the HV lines together with additional smoothing capacitors.
