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             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.
Picture
                                                                  Main HV board fitted
Picture
Fortunately there is a cavity in the front panel  making the transformer a snug fit, the panel also accommodates the mains switch, neon etc
Picture
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!
Picture
                                   The Finished Unit
Picture
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. 
                                        
                                                          Circuit Diagram
Picture
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.














































































































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