It is currently Mon Mar 16, 2020 10:03 am

All times are UTC - 7 hours



Post new topic Reply to topic  [ 3 posts ] 
Author Message
Post subject: Bias BDRI Svetlana
Posted: Sat Feb 23, 2019 8:48 pm
Offline
Hobbyist
Hobbyist

Joined: Sat Feb 23, 2019 8:39 pm
Posts: 1
Hey, I have a BDRI and switched out the default GT tubes for jans Phillips (5771), and tung sol for preamp tubes. I’m using svetlana gc6l6 for power tubes. After playing for 30 minutes the bias reading is 92.3mV. The power tubes are glowing orange and a faint blue light is present. No cherry red colour. Is 92.3mV too hot? Looking for all the experts to chime in lol. Thanks


Top
Profile
Fender Play Winter Sale 2020
Post subject: Re: Bias BDRI Svetlana
Posted: Mon Mar 04, 2019 7:50 pm
Offline
Rock Icon
Rock Icon
User avatar

Joined: Tue Jun 29, 2010 1:20 pm
Posts: 9640
Location: Indiana
Hey Jon,

Sounds just about right to me. Rated tube wattage times 0.7, divided by Plate voltage will be about right for this amp, plus or minus a few mA.

By my calculations, 30 watt tube times 0.7, divided by 430 volts, equals about 48 mA per tube, or 96 mA at the test point (96 mA total for 2 tubes). So if your Plate voltage is about 430 volts, you’re in the right range.

_________________
---> "The amp should be SWITCHED OFF AND UNPLUGGED before you do this!" <---

Por favor, disculpe mi español, no se llega a la práctica con mucha frecuencia.


Top
Profile
Post subject: Re: Bias BDRI Svetlana
Posted: Wed Mar 06, 2019 3:40 am
Offline
Rock Icon
Rock Icon
User avatar

Joined: Fri Feb 05, 2010 4:31 am
Posts: 14045
Location: Province de Québec, Canada
Are both tubes are matched ?
Within 3 to 9 ma is ok


Top
Profile
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 3 posts ] 

All times are UTC - 7 hours

Fender Play Winter Sale 2020

Who is online

Users browsing this forum: No registered users and 2 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum

Search for:
Jump to: