it is a little crazy, its nice to play with something that leads into other realms of the tube universe.
that 845 build sounds fun, haven't had the chance to play with power triodes yet, looking forward to see it posted if you get it up and running
I always surprised that more audio projects don't pop up on TAG, might be good little addition, new category etc...
Power tube as a R-C stage
Moderators: pompeiisneaks, Colossal
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Andy Le Blanc
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- Location: central Maine
Re: Power tube as a R-C stage
lazymaryamps
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Reeltarded
- Posts: 10189
- Joined: Sat Feb 14, 2009 4:38 am
- Location: GA USA
Re: Power tube as a R-C stage
Ya know what's cool? Mic amps. RCAs and Fearns and anything like RCAs, like Westerns, and RCAs.
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gingertube
- Posts: 531
- Joined: Mon Nov 14, 2011 2:29 am
- Location: Adelaide, South Oz
Re: Power tube as a R-C stage
Andy,
I will post the design when done. I have some experience with 845 as a result of running a Chinese Music Angel 845 SET on the HiFi for a while (until it shorted an output tranny and blew up). I worry a bit about their robustness for portable equipment, I have some shock mounts left over from the day job (designing airborne electronics) and I am mounting the 845 on a "floating" sub chassis which is then shock mounted to the main chassis.
The other problem with these big tubes is their operating voltage, I'm going +850V rail for 20W out for the guitar amp but for HiFi they operate best up at around +1250 Volts (30 to 35 Watts Out). That is just not RECOMMENDED territory for your standard hobbiest.
Cheers,
Ian
I will post the design when done. I have some experience with 845 as a result of running a Chinese Music Angel 845 SET on the HiFi for a while (until it shorted an output tranny and blew up). I worry a bit about their robustness for portable equipment, I have some shock mounts left over from the day job (designing airborne electronics) and I am mounting the 845 on a "floating" sub chassis which is then shock mounted to the main chassis.
The other problem with these big tubes is their operating voltage, I'm going +850V rail for 20W out for the guitar amp but for HiFi they operate best up at around +1250 Volts (30 to 35 Watts Out). That is just not RECOMMENDED territory for your standard hobbiest.
Cheers,
Ian
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Reeltarded
- Posts: 10189
- Joined: Sat Feb 14, 2009 4:38 am
- Location: GA USA
Re: Power tube as a R-C stage
I want to see this thing work! That sounds crazier than I had imagined by at least a few hundred volts.
omg
omg
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Andy Le Blanc
- Posts: 2582
- Joined: Sat Dec 22, 2007 1:16 am
- Location: central Maine
Re: Power tube as a R-C stage
That HT V is daunting, I don't think my DMM will even go there.
I've seen that if you exercise basic care during load in, set up, and tear down at a gig,
even fragile gear will make it and be reliable.
Many of the repairs I see across the bench are the result of gear being tossed around by stoned and drunk players at the end of crap gigs, just wanting to get the F@#& home, bouncing around in the back of the gig mobile etc...
A little TLC can go a long way.
I've seen that if you exercise basic care during load in, set up, and tear down at a gig,
even fragile gear will make it and be reliable.
Many of the repairs I see across the bench are the result of gear being tossed around by stoned and drunk players at the end of crap gigs, just wanting to get the F@#& home, bouncing around in the back of the gig mobile etc...
A little TLC can go a long way.
lazymaryamps
Re: Power tube as a R-C stage
Just measure it in two steps, relative to abother B+ source.Andy Le Blanc wrote:That HT V is daunting, I don't think my DMM will even go there.
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Reeltarded
- Posts: 10189
- Joined: Sat Feb 14, 2009 4:38 am
- Location: GA USA
Re: Power tube as a R-C stage
Oh yeah, you are gonna need a special meter... like this one I made..
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JazzGuitarGimp
- Posts: 2357
- Joined: Mon Jul 23, 2012 4:54 pm
- Location: Northern CA
Re: Power tube as a R-C stage
Now THERE'S a power supply!Reeltarded wrote:Oh yeah, you are gonna need a special meter... like this one I made..
Lou Rossi Designs
Printed Circuit Design & Layout,
and Schematic Capture
Printed Circuit Design & Layout,
and Schematic Capture
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renshen1957
- Posts: 498
- Joined: Fri Feb 20, 2009 8:13 am
- Location: So-Cal
Re: Power tube as a R-C stage
Hi Andy,Andy Le Blanc wrote:That HT V is daunting, I don't think my DMM will even go there.
I have a Vacuum Tube Multi Meter that measures to 1000 volts DC by Hewlett Packard. The old equipment ("Boat Anchors") really work well for Tubes, what they were designed for (Higher voltages).
Best Regards,
Steve