how to wire mercury O45RS-L and P45RS

kwm488 · Post by **kwm488** » Tue Mar 18, 2008 9:46 pm

hi

i want to buy this MM PT and OT and install in my bluebreaker. do anyone can teach me how to install?

i use KT66. i ask MM, he suggest me to use 6.6K. and i choose 16ohm for secondary.

about the OT, is it connect one green white to power tube pin 5 and green to another power tube pin 5? tap and unuse all 8K 9K and UL Taps? but i don't know how to wire secondary.

about the PT. i don't know why it has two set of 6.3V wire? which set i should use? and it also have another orange wire to carry 6.3V ? about brown wire, i connect it to ground?

please help

kwm488 · Post by **kwm488** » Mon Mar 24, 2008 10:43 pm

can anyone help me

6string · Post by **6string** » Fri Mar 28, 2008 10:39 am

Hi,

I used those very transformers in my build. Excellent choices.

You should use both of the 6.3V taps since they are rated at 2.5 amps each. The spec sheet for KT66's shows that they can draw 1.3 amps each, so two of them need 2.6 amps. Add in your pres and phase inverter and you're at 3.5 amps. Split it up however you want to do it since the taps are only 2.5amp each. I just used one tap on V5, and the the other tap for V1-V4 because my heater wires were already in place and it was the easiest solution.
You wont use the brown, white, or orange wires on the secondary side.

On the OT, your green primary 6.6K wires connect to the power tubes on pin 3, not pin 5. Just put some heat shrink over the ends of the remaining primary wires and roll them up out of the way. I wouldn't cut them... you may want try a different primary impedance at some point. I started out with the 8K primary but ended up using the 6.6K.
As for the secondary wiring, if want to hard wire it for 16 ohms:
Brown is the positive speaker out.
White is the negative speaker out.
Red and Black get connected to each other.
Blue and Green get connected to each other.

I ended up using Jones plugs so I could have selectable impedance, but in a combo amp, you probably don't require that.
Here's a thread on the Jones plugs:

http://forum.metroamp.com/viewtopic.php?t=17272

Hope this helps...

kwm488 · Post by **kwm488** » Fri Mar 28, 2008 11:20 am

HI

thank you for your help.

but if i don't use brown ,white and orange. how can the rec tube working?
the rec tube need 5V to be heater.

as the OT, i hope to use UL tap. do you mind to let me know how should i do ?

last, because My amp is bluebreaker. this amp have 4 preamp tube. and all the heater wire is connected. can i use grey set 6.3V to pwoer tube and green set 6.3V for preamp tube?

6string · Post by **6string** » Fri Mar 28, 2008 2:13 pm

kwm488 wrote:HI

thank you for your help.

but if i don't use brown ,white and orange. how can the rec tube working?
the rec tube need 5V to be heater.

as the OT, i hope to use UL tap. do you mind to let me know how should i do ?

last, because My amp is bluebreaker. this amp have 4 preamp tube. and all the heater wire is connected. can i use grey set 6.3V to pwoer tube and green set 6.3V for preamp tube?

Sorry... My bad. You will use the brown and white on the rectifier pins 2 & 8.

The UL primary wires are the white ones.

The simplest solution since all of the heaters are already run, would be to remove the heater wires between the two power tube sockets, then connect one of the 6.3V taps to one socket, and connect the other 6.3V tap to the other socket.
I believe the preamp tubes pull about .3 amps each, so four of them could pull 1.2 amps. Add that to the 1.3 amps on one KT66 and you have 2.5 amps on that leg. The other tap on the lone KT66 would only be pulling 1.3 amps.
The other option would be to remove the heater wires between V2 and V3, as well as the wires between the power tubes. Then run a new set from V6 to V2. You then would have V1, V2, and V6 on one set, and V3, V4, and V5 on the other set. A little more work, but then each 6.3V tap would have the same 1.9 amp draw.

kwm488 · Post by **kwm488** » Fri Mar 28, 2008 2:16 pm

Hi

do you mind to let me know how to connect UL tap?

i just have this question now. i want to use UL tap, but i don't know how should i do. can you teach me

thank

6string · Post by **6string** » Fri Mar 28, 2008 2:37 pm

Well, I'm not certain about that. It seems that Ive read somewhere that for UL, you need to use the both the 6.6K and the UL taps . How it gets wired I'm not sure. I would call Mercury and talk to someone about that to be certain.