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RT2/50 Tube Layout?

 
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Resonant Alien
RM20


Joined: 09 Jun 2008
Posts: 4

PostPosted: Tue Feb 16, 2010 1:15 pm    Post subject: RT2/50 Tube Layout? Reply with quote

Can anyone confirm the tube layout in the RT2/50? Looking at the back of the amp, I think it's Ch2 power tubes on the left, Ch1 power tubes on the right. What about the 12AX7 input drivers and phase inverter? Is it Left-to-Right from back: Ch2 input driver, Ch1 input driver, phase inverter?

Thanks
Rick
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JKD
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PostPosted: Tue Feb 16, 2010 1:41 pm    Post subject: Reply with quote

I always forget the powertube/channel layout even though I've posted it probably 5 or 6 times lol...I eventually put tape on mine so I'd remember.

There's a phase inverter for each pair of power tubes and they are in the middle of the two respective channels power tube pairs..leaving the one over on the side as the input buffer/driver...it's common to both channels.
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Resonant Alien
RM20


Joined: 09 Jun 2008
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PostPosted: Wed Feb 17, 2010 7:42 pm    Post subject: Reply with quote

Got an answer from Bruce himself via email. Layout is as below:

Left to Right, Top to Bottom, looking at the amp from behind:

Ch2 Pwr Tube1 >>>>>> Ch2 Pwr Tube2 >>>>>>> Ch1 Pwr Tube1>>>>>>>>>Ch1 Pwr Tube2
Ch2 Phase Inverter >>>>>>>> Input driver/buffer (both) >>>>>>>>> Ch1 Phase Inverter
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MarcoR
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PostPosted: Tue Jun 12, 2012 7:12 am    Post subject: Reply with quote

So there are 2 P.I. tubes? Does anyone use anything special in these positions? Since there's a P.I. for each channel, is it worth using different tubes to complement the power tubes? I usually ran something like a Sovtek 12AX7LPS in my MOD50 P.I. position.
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withmittens
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PostPosted: Tue Nov 21, 2017 11:45 am    Post subject: Reply with quote

digging one up from the grave

has anyone come to any conclusions for themselves on this question.

2 x PI. does it matter? what do you use?
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MarcoR
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PostPosted: Tue Nov 21, 2017 12:00 pm    Post subject: Reply with quote

withmittens wrote:
digging one up from the grave

has anyone come to any conclusions for themselves on this question.

2 x PI. does it matter? what do you use?


I read the comment above yours and was like pfft... that s*&t doesn't matter.. and then realized it was my comment. Shocked

I was using it in switching mode at the time and wondered if anyone could notice a difference in the PI I guess...
The PI can make a difference especially if the one you're replace was bad. If your a real sniffer you might notice a difference with different PIs but if your using two types of power tubes, how would you know?
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withmittens
Lynch Box


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PostPosted: Wed Nov 22, 2017 12:26 pm    Post subject: Reply with quote

yeah, to be honest, I guess i can hear a slight difference if I have an AT7 in one and AX7 in the other. maybe but again, all the mods are different

then it's just taste in tubes and how much money you have.
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Mattfig
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PostPosted: Wed Nov 22, 2017 2:25 pm    Post subject: Reply with quote

I like a 5751 in the PI spots of all Randall MTS amps including RT2/50.....Just a personal preference I guess....JAN GE sound best but are spendy...
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Nightdare
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PostPosted: Thu Nov 30, 2017 3:57 pm    Post subject: Reply with quote

Mattfig wrote:
I like a 5751 in the PI spots of all Randall MTS amps including RT2/50.....Just a personal preference I guess....JAN GE sound best but are spendy...


I had a 5751 JAN GE once, pricey little bugger
..then the frigging bulb failed within just a few weeks use Mad
while the various cheap ass MiC pre's I use are still going strong to this day
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