New idea: RE084 drives RS282

[Zoran]

Here are the parameters. Thoughts?

OK but it is not even 9.1K because it is for 9 ohm secondary load?
the impedance square ratio is 9100 / 9 = 1011
So with 8 R load it will be about 8090 R @ anode load
and with 7 R it will be 7080 R @ anode...
Anyway the slope will be slightly different, little bit more power but also more THD
...

800-0-800 with 48R DCR for each secondary???

The same Q for the power transformer - is it 2 x 800Vac with C.T (1600Vac)
.
Please also write the values of power chokes L and Rdc
Is these values like on the PSUD schemais of power supply?
.
Thanks

 

[Zoran]

I see Thanks
Very useful power transformer !
.
Choke values?

 

[banpuku]

Choke values are exactly as the PSUD schematic. PT is 800-0-800.

 

[Zoran]

OK
thanks
.
please check in the PSUD:
this 1st C in PS after rectifiers.
Has very high voltage peak at the start.
So the voltage rating of that 1st C should be more than that...

 

[banpuku]

The first C (large C, not the small 1uF c) is rated for 1100V.

 

[Zoran]

The first C (large C, not the small 1uF c) is rated for 1100V.

C1=1uF in Your schematic. Check the peak voltage on that C...

 

[euro21]

PT is 800-0-800.

48R DCR in each 800V coil?

 

[50AE]

I found my coil design notes. The power transformer has 1880T per leg on 212mm MLT with a 0.355 wire, so that should give 67Rdc to 70Rdc. Pat has the datasheet. Or he could place an ommeter on one leg.

 

[euro21]

I asked it, because each tube rectifier requires definite RDC for given current, so series resistance (on each anode) may be necessary (must to calculate its value).

BTW, Pat you want to use 866 as rectifier?
I use mercury vapour rectifiers, using them is not an easy thing.
Preheating requires for MV heaters, even few minute heating before the main PT (HV secondary) turn on.

 

[banpuku]

I have been using 866 and 83 mercury rectifiers for 8 years without any issues. And yes, I preheat them each time before turning on HV.

 

[euro21]

Pat,
Are you read this?

https://www-radiomuseum-org.transla....html?_x_tr_sl=auto&_x_tr_tl=en&_x_tr_hl=en#1

That might explain the higher distortion at larger swing.