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Thanks Susnick, the Hammonds 159z takes around 200hrs for break-in and the tubes around 70 hrs. Capacitors will take another 300hrs and around 50hrs to 60hrs for the wires and solders. Will post my listening impression post that. Also my stock OPT will need to be replaced by Softone after a while when they are available. Till then stay tuned.Well done Hari, looking forward to further impressions...
Where did you manage to buy incandescent bulbs? Please could you share the source?Last week and this made some interesting discoveries concerning power supply topology in tubes and how much they affect overall tone of an amplifier. It makes me wonder that how much we discuss about power cables and it's impact which could be either minute or huge without giving much thought about how good are the amplifie's power supply is actually designed. What I want to say is don't pour money changing power cables if your amplifier's and other components of your gear's power supply is just basic. Only if you have a well designed power stage in your amplifier will any change in cable will actually matter ( if at all).
In this DIT tuve amplifier I have used 2 chokes each in my power stage in an LCLC arrangement and they cost almost 10k for four numbers. But the correct tonality and dynamic range came from replacing the 2 chokes with an 200 watts incandescent lamp and I have now changed the confirmation to RCRCRC ( Where R is an incandescent lamp of 100, 200, 200 watts each). Total cost just 100/- for both channels . Almost 100 times lower than using chokes. I have now listened for a week and posting after that. I also did a simulation with PSUD2 why the lamps sound better than the chokes to my ears and discovered that there is a rectifier pulse noise using chokes which is not present in the bulbs. Also the current drawn by the load (amplifier) during the draw cycle is pulsed and noisy and also not in-phase with the voltage with chokes, but with bulbs it's clean DC draw not pulsed and in-phase with voltage. All this simulation made me wonder how much time and money we spend on power cables, where the solution could lie somewhere else which could be very cheaper and better.
Now with this topology I can't now say it's same as originally designed by Jeff, but a modified version of his design.
Thanks for looking.
Good suggestion Jeff, but most corporate offices have not resumed international travel ( including mine) and that will continue for atleast 6 more months if my guess is correct. If anyone traveling to Japan and back read this post - please contact me.Hari,
Does any friend on this Forum know of people who travel back and forth, India to Japan and back, so they can personally help to get you a pair of Softone RW-20s???