News: Reduction and BeePre on sale this week!
June 25, 2017, 10:37:48 am

Author Topic: Paraglow II Repairs and upgrades  (Read 494 times)

0 Members and 1 Guest are viewing this topic.

Offline kgwrocks

  • Newbie
  • *
  • Posts: 4
    • View Profile
Paraglow II Repairs and upgrades
« on: March 13, 2017, 07:01:52 pm »
My beloved Amplifier Bottlehead Paraglow IIs needed some repairs. So I upgraded the 4-pin tube sockets, hum pots & resistors, power resistors.
Pictures attached.

Offline Doc B.

  • Administrator
  • Hero Member
  • *****
  • Posts: 6762
    • View Profile
    • Bottlehead
Re: Paraglow II Repairs and upgrades
« Reply #1 on: March 13, 2017, 08:30:05 pm »
It is also very important that you replace the electrolytic capacitors. When we get a Paraglow in for refurb we replace each of the 100uF 450V caps with two 270uF 350V rated caps in series with a 100K resistor across each one to equalize the voltage across them. This gives you a 135uF caps rated for 700V. That is a much better rating for the job since the power supply often surges over 500V at startup. As old as the Paraglow is (and thus its original capacitors are), this is a must.
Dan "Doc B." Schmalle
President For Life
Bottlehead Corp.

Offline kgwrocks

  • Newbie
  • *
  • Posts: 4
    • View Profile
Re: Paraglow II Repairs and upgrades
« Reply #2 on: March 14, 2017, 05:12:09 am »
Thanks Doc. I will do that.

Offline Doc B.

  • Administrator
  • Hero Member
  • *****
  • Posts: 6762
    • View Profile
    • Bottlehead
Re: Paraglow II Repairs and upgrades
« Reply #3 on: March 14, 2017, 05:54:17 am »
BTW 270K or even 470K resistors are fine to use too.
Dan "Doc B." Schmalle
President For Life
Bottlehead Corp.