Search found 821 matches

by jontheid
Mon Oct 03, 2016 9:54 pm
Forum: Technical
Topic: Mat Mathias design intentions, when building OR100/OR120
Replies: 9
Views: 2932

Re: Mat Mathias design intentions, when building OR100/OR120

It is from the Orange website!

https://orangeamps.com/heritage/legacy- ... ge-matamp/" onclick="window.open(this.href);return false;
by jontheid
Sun Sep 18, 2016 10:57 pm
Forum: Technical
Topic: Rocker 30 "Cathode Resistor" mod.
Replies: 15
Views: 3044

Re: Rocker 30 "Cathode Resistor" mod.

The important thing to remember is that a 7 watt 470 ohm resistor will behave in exactly the same way as a 6 watt 470 ohm resistor in the Rocker 30. It can just handle dissipating one extra watt of power. You could put a 50 watt 470 Ohm resistor in and it would behave the same. Wattage ratings for r...
by jontheid
Sun Sep 18, 2016 8:42 pm
Forum: Technical
Topic: Rocker 30 "Cathode Resistor" mod.
Replies: 15
Views: 3044

Re: Rocker 30 "Cathode Resistor" mod.

Why not use 7 watt 470 Ohm resistors then?
These are readily available.
Having cathode resistors with more power handling capability is not going to be a problem.
by jontheid
Tue Aug 09, 2016 11:07 pm
Forum: Technical
Topic: Wire output jack for 16 ohm and 4 ohm on PPC212
Replies: 7
Views: 1197

Re: Wire output jack for 16 ohm and 4 ohm on PPC212

Is this what you are driving at?
Image
by jontheid
Thu Jul 21, 2016 6:50 pm
Forum: Community Discussion
Topic: OR100 GAIN BOOST "ALWAYS ON" MOD
Replies: 26
Views: 5839

Re: OR100 GAIN BOOST "ALWAYS ON" MOD

I'm no tech guru but wouldn't just switching the tip to sleeve and vice versa make the led be lit at on position instead? Unfortunately it doesn't. Switching tip/sleeve just means the led stops working altogether! Pedal would still work though. Read on and this should make sense why. With a FS in o...
by jontheid
Tue Jul 19, 2016 10:20 pm
Forum: Community Discussion
Topic: OR100 GAIN BOOST "ALWAYS ON" MOD
Replies: 26
Views: 5839

Re: OR100 GAIN BOOST "ALWAYS ON" MOD

The OR100 manual states: Boost, Global footswitch jack socket Use any latching footswitch to add an overall volume boost to either channel. (Note – This works well for louder lead solos where extra gain is not required. An Orange footswitch will be lit up when the boost is not engaged ) Gain Boost (...
by jontheid
Sun Jul 17, 2016 10:42 pm
Forum: Technical
Topic: (two amps in a single speaker) is this method safe?
Replies: 6
Views: 1119

Re: (two amps in a single speaker) is this method safe?

It is all a bit strange. Some reviews on-line say Micro Terror is a Class D amp.
This thread here http://www.freestompboxes.org/viewtopic.php?f=2&t=22030" onclick="window.open(this.href);return false;
... shows us that the power amp chip is an STA540, a 4 x 13W Class AB chip.
hmmm.
by jontheid
Sun Jul 17, 2016 10:38 pm
Forum: Technical
Topic: (two amps in a single speaker) is this method safe?
Replies: 6
Views: 1119

Re: (two amps in a single speaker) is this method safe?

Micro Dark manual states:
If the Phones jack is not in use, a suitable speaker cabinet must be connected at all times during use.
by jontheid
Sat Jun 25, 2016 10:08 pm
Forum: Community Discussion
Topic: reduce power on an AD30
Replies: 30
Views: 3704

Re: reduce power on an AD30

Jondog wrote:You can also see in the schematic of the Dual Terror how it switches the output taps at the same time on the switch. Theres 3 taps there 16 , 8 and 4 ohms. The 4 ohms acts as 8 ohms with the two tubes.
Yes! Very nice bit of design.
by jontheid
Sat Jun 25, 2016 9:15 pm
Forum: Community Discussion
Topic: reduce power on an AD30
Replies: 30
Views: 3704

Re: reduce power on an AD30

I was just being thick. Not the first time. It is a lot easier to see on the Dual Terror schem. how it works, you are just pairing the tubes differently, the reason being that the 2/4 tube switching option does so by cutting of one 'push' and one 'pull' tube by making the cathode resistor be in seri...
by jontheid
Sat Jun 25, 2016 8:32 pm
Forum: Community Discussion
Topic: reduce power on an AD30
Replies: 30
Views: 3704

Re: reduce power on an AD30

It could be modded by cutting two copper traces and adding two wires. You could put it on a switch too easily enough. Just have to remember to change the output jack. http://i23.photobucket.com/albums/b374/douglasdog/AD30mod_zpskdhgihzn.png I'm a bit confused as how this is supposed to work. In my ...
by jontheid
Wed Jun 22, 2016 10:38 pm
Forum: Community Discussion
Topic: reduce power on an AD30
Replies: 30
Views: 3704

Re: reduce power on an AD30

The remaining two tubes would be biased really hot.
Think red-plating, meltdown etc.
by jontheid
Wed Jun 22, 2016 10:20 pm
Forum: Technical
Topic: Help with 4x12 wiring
Replies: 4
Views: 1536

Re: Help with 4x12 wiring

It is so you can 'daisy chain' two cabs together. It wires them in parallel.
by jontheid
Wed Jun 22, 2016 10:10 pm
Forum: Community Discussion
Topic: reduce power on an AD30
Replies: 30
Views: 3704

Re: reduce power on an AD30

It's not safe. The "push" pair of valves and the "pull" pair each self bias through one cathode resistor. Yes, there are two cathode resistors in the AD30, one for the 'push' pair and one for the 'pull' pair. To use the 'pulling two tubes' trick to reduce power in a cathode biased amp each output t...
by jontheid
Wed Jun 22, 2016 3:24 pm
Forum: Community Discussion
Topic: TH100 Bias ?
Replies: 15
Views: 3056

Re: TH100 Bias ?

Some of the Peaveys use the negative grid voltage in their test points which is inaccurate.
I think this must include the 6505+, I've looked at the schematic and there are no cathode resistors to measure across.