Hi, a friend of mine brought me his head SPLAWN for re-valve , I setting the bias (40mA x tube), but when I checked the anode voltage of the power tubes (EL34) , i measured 380Vdc , this is a low voltage for this type of amp or is a project characteristic?
Anyone have one of this amp for compare?
Thanks very much
Splawn head!!
Moderators: pompeiisneaks, Colossal
Re: Splawn head!!
Not sure about this amp but it appears you are biasing at 60% which may be too hot.
If you lower the bias, the plate voltage will go up but how much depends on the amp and power supply.
If you lower the bias, the plate voltage will go up but how much depends on the amp and power supply.
Tom
Don't let that smoke out!
Don't let that smoke out!
Re: Splawn head!!
Hi structo , If I lower the bias , anode voltage don't change!
I think to be ok , with this table:
http://www.webervst.com/tubes1/calcbias.htm
I think to be ok , with this table:
http://www.webervst.com/tubes1/calcbias.htm
-
Reeltarded
- Posts: 10189
- Joined: Sat Feb 14, 2009 4:38 am
- Location: GA USA
Re: Splawn head!!
40+ expected. That sounds middle/cool... and if it sounds good it is good.
I bias my low 400 amps right up to 40-ish.
I bias my low 400 amps right up to 40-ish.
Signatures have a 255 character limit that I could abuse, but I am not Cecil B. DeMille.
Re: Splawn head!!
Thats odd must have a very stout poweer supply.grtamp wrote:Hi structo , If I lower the bias , anode voltage don't change!