Geek wrote:TerrySmith wrote:One thing to note is the 4T360 transformer is capable of over 1000ma (1 ampere) of current on the 360v secondaries! I would strongly suggest NOT using a tube rectifier as it will live a very short life.
Here you go. Been running for over a year with no failure:
With an SS, full-wave rectifier, the power supply will put out a theoretical 510Vdc.
Cheers!
On that SS rectifier you have two 75R current limiters. If those were used in a tube rectifier circuit there would be no worries about too much current available from the Antek. If you read the Antek specs you'll see it has 22R DCR on each secondary half which is only about 10R less that the original Dynaco PT. It also has about twice the primary DCR which also helps toward having enough DCR for a 5AR4. If the input capacitance is limited to the same 30uf as the original '70, there should be no worries abouth the current rating of the Antek. The total DCR of the Antek about 40R is nearly equal to the original PA060, (about 40R). With a choke and limited input capacitance all should be fine with the 5AR4.
The formula is ... one secondary half DCR, + [tranny turns ratio(squared) x the primary DCR].
For the Antek... 22 + [(3 squared) =9 x 1.9] = 40R
If your load is equal to or less than the original ST-70 design there should be no problem. If you reduce your choke, you'll have problems. If you add capacitance, you'll have problems.
You'll have another issue though with no bias tap. You'll have to go with cathode biasing. You won't be building an ST-70.
Headed for Tishomingo to sing in a can...