Another OR80 question

fuzzzd · Post by **fuzzzd** » Sat Sep 14, 2002 1:47 am

On the back of my or-80 theres the voltage selector that unplugs and I'm curious re:switchability? Seems like a different voltage setiing might act like a power brake? Or like a variac (fixed voltage of course) Is this a lunatic idea? Are the other voltage settings just there but unwired? e.g. they would be wired for whatever country they were being sent to? Thanks in advance for any info, stern lectures, etc..

Fuzzzd

geertjacobs · Post by **geertjacobs** » Tue Oct 01, 2002 9:28 pm

The voltage selector is not meant as a power brake.
What is possible is when you have a 230V mains you can choose to have the selector at 220V mains or a 240V mains. This might have some effect in sound, but not much I think.
However if you change the voltage setting, you need to rebias your output tubes again too!!!
So it's not something to play around with.

G.

http://www.geocities.com/geertjacobs/orange_page.htm

iqbal · Post by **iqbal** » Tue Oct 15, 2002 3:16 am

Is there voltage selector there becasue the OR80 is fixed bias?

Also, becasue the OR80 is a fixed bias, does that mean, the bias 'can't be adjusted'?

If so, if I wanted to re-tube with EL34's, can I just put them in as long as they are Matched?

Post by **bclaire** » Wed Oct 16, 2002 12:00 am

The voltage selector has nothing to do with bias. Oranges can be biased. The voltage selector is for the different voltages around the world- nothing else. Set the voltage selector for the voltage in your country and PAY an amp tech to bias your amp. Oranges are picky about bias and you can burn up tubes (and your amp) if you don't have it done professionally. Billy

iqbal · Post by **iqbal** » Wed Oct 16, 2002 2:34 am

Thanks Billy! So, since I'm in The States, should I select the 100 Volt option?

Post by **bclaire** » Thu Oct 17, 2002 8:02 pm

I don't have mine in front of me..... what are the choices? I think it's the one above 100V, like 115 or 117. Billy

iqbal · Post by **iqbal** » Fri Oct 18, 2002 1:46 am

I don't have mine in front of me either, but I think it's:
100, 120, 220 and 240.
So you recommend the 120 setting?

That's for your input Billy!

Post by **bclaire** » Fri Oct 18, 2002 11:52 pm

Definitely 120V.

Tibor · Post by **Tibor** » Sat Oct 19, 2002 8:12 am

and now please once for for the old world..220 or 240 Volts? Its function on both settings very well....i can hear no diffrent.

OF TOPIC...what kind of Loop does Orange use? Paralell or Serial? only for Info...

Why is an ORANGE, orange? If it would be Green it would be an apple....

VintageJon · Post by **VintageJon** » Sat Oct 26, 2002 3:52 am

PLEASE SET THE MAINS SELECTOR FOR THE CLOSEST VOLTAGE TO WHAT COMES OUT OF THE WALL IN YOUR COUNTRY. DISASTER IS SURE TO FOLLOW IF YOU DO
NOT!
I have seen amps with burned-up power transformers here in the USA
by folks who ran it at 240V rather than 120V- on Marshalls anyway. The Orange is no different as the same formula can be applied to any
transformer.
A friend, amp tech in Scotland, has seen several flamed amps due to
people setting the selector for 110V and running it on the 240V coming
from the wall in Scotland.

NEVER try to use this selector as a "power brake". The "power brake"
and similar devices deal with the Output Transformer NOT the Power Transformer!

FIXED BIAS means the bias is set by a FIXED voltage on the grid of the output tubes. It must be adjusted for each individual set of tubes.

-Jon

iqbal · Post by **iqbal** » Thu Nov 07, 2002 11:55 pm

Thanks Jon!

By the way, do you have an point-of-view on the Ruby Tubes Play & Play Adaptor? I believe the adaptor 'coverts' the tube into a Triode, and doesn't require biasing.

It sounds similar to the EC34ET available thru Matamp, but the Ruby doesn't require changing the bases/sockets.

I'd be curious to head what you think of triodes on an OR 80.

Thanks again Jon!

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