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6V6 line preamp
6V6 line preamp
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Old 14th June 2018, 03:48 PM   #3371
Anchan is offline Anchan  United States
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Quote:
Originally Posted by Salas View Post
No if you also put a 10k-20k log pot after it
Without the pot, there are some issues?
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Old 14th June 2018, 06:33 PM   #3372
Salas is offline Salas  Greece
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6V6 line preamp
There is very high input impedance in the buffer that will reflect to the primary if without any resistor from input (before cap) to ground. Maybe it can pick noises easier. But you can also define the input impedance of the buffer with just a resistor in the pot's place.
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Old 14th June 2018, 10:38 PM   #3373
Anchan is offline Anchan  United States
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Ok, makes perfect sense. Thanks!

Quote:
Originally Posted by Salas View Post
There is very high input impedance in the buffer that will reflect to the primary if without any resistor from input (before cap) to ground. Maybe it can pick noises easier. But you can also define the input impedance of the buffer with just a resistor in the pot's place.
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Old 16th June 2018, 03:58 PM   #3374
skrstic is offline skrstic  Serbia
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50Hz hum. Vhat can I do?
SSHV is not plug in.
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Old 17th June 2018, 02:57 AM   #3375
Salas is offline Salas  Greece
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6V6 line preamp
Another newer build? Is it the cathode follower? Are the heaters grounded to chassis?
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Old 17th June 2018, 06:23 AM   #3376
skrstic is offline skrstic  Serbia
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Not a new. It's CF but in enclosute. Hum vas little less earlier but preasent. Heaters grounding is from left and righ to central tap.
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Old 17th June 2018, 07:54 AM   #3377
haiqu is offline haiqu  Australia
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Beam power tetrode used as a line preamp? Hmmm ...
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Old 14th September 2018, 12:47 AM   #3378
Anchan is offline Anchan  United States
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Default Slowly getting started

I'm gathering the parts to get this project started. I got this awesome Radiodyne chassis to build it into (attached). It even has a spring suspension platform for the tubes. Perfect! I'm going to build both the follower and gain version into the same chassis, because I have the room, and it's not that much more work to do both at the same time.

A few questions though:
For the follower version:
  1. What does FT-3 mean on the input cap?
  2. What wattage resistors for 180R, 470R, and for the 5K is that 20W?

For the gain version:
  1. I’m going to source everything from Mouser or Digikey. What easy to find resistor types do you recommend in place of the 5W and 2W Kiwame?
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Last edited by Anchan; 14th September 2018 at 01:10 AM.
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Old 14th September 2018, 06:23 AM   #3379
skrstic is offline skrstic  Serbia
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FT-3 is Russian teflon capacitor. 180R/5W , 470/2W and 5K/10W (2x10k/5W).


I borrowed from a friend a 4.7uF Mundorg capacitor. Is it OK to try?

PS. Hum is gone. Bad ground wiring.
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Old 14th September 2018, 06:38 AM   #3380
nikosokey is offline nikosokey  Greece
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Two words and from me. Ever since I finished this construction never came down from my audio system....
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Last edited by nikosokey; 14th September 2018 at 06:44 AM.
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