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EQUIPMENT FORUMS >> TORII JR >> Help! Valve Art 274B Failure
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Message started by 2a3smith on 02/16/19 at 22:28:33

Title: Help! Valve Art 274B Failure
Post by 2a3smith on 02/16/19 at 22:28:33

Another VA 274B just failed in my Torii Jr. I won’t be using any more VA 274B’s. Took out the bad tube and replaced it with a Sophia Electric 274B Aqua, which I’m also using in my CSP3 25. I was all set to rebias the amp and noticed the OA3’s were not lit up and my multimeter is showing zero voltage. Did a fuse blow when the 274B failed? Is that why the OA3’s are dark? The OA3’s couldn’t have failed, could they?

Appreciate any thoughts on this before I unhook everything and open the amp to check for a bad fuse.

Thanks, Doug

Title: Re: Help! Valve Art 274B Failure
Post by Lon on 02/16/19 at 22:35:37

Is the fuse in the incoming power outlet on the Jr. as it is on many of the other amps? Easy to check that. In my experience if a rectifier fails, the fuse blows, other tubes are saved. . . .

Title: Re: Help! Valve Art 274B Failure
Post by Lon on 02/16/19 at 22:37:57

Just looked at the manual and yes, the fuse appears to be in the IEC inlet. Just unplug the power cord and flip open the little compartment in the front with a key or small screwdriver or dime. There may also be a spare fuse in the little fuse holder as well. . . .

Hope it's just a fuse and you're back in biz.

Title: Re: Help! Valve Art 274B Failure
Post by 2a3smith on 02/17/19 at 05:45:14

Thanks for the quick reply, Lon.

The amp powers up just fine, with the new Sophia rectifier and the el34’s lighting up; only the OA3’s are dark, and I get no voltage on my multimeter when attempting to set the bias.

I think I recall reading that there are two or three internal fuses in the Jr., but of course I can’t find that information now. I guess I’ll open it up tomorrow and take a look.

Do you have any additional thoughts or ideas?

Title: Re: Help! Valve Art 274B Failure
Post by Lon on 02/17/19 at 12:25:10

Okay, I didn't realize the other tubes have power. . . .

Yes, it is possible that there are fuses inside, I know that Steve has added a little fuse box inside the Monoblocks I have and I am unfamiliar with the Torii Jr. and he may have added interior fuses to that model. I think your plan of going inside to looks makes the most sense short of calling Steve on Monday. Hope you can get it going!

Title: Re: Help! Valve Art 274B Failure
Post by Geno on 02/17/19 at 17:44:36

I went through this a while back with my Zen. One of the internal fuses was bad. You could just replace all of the fuses while you have it open.

Also, after replacing the fuses, unplug your power cord from the wall before plugging into the amp. After plugging into the amp, then plug into the wall. I was not doing this and blew 2 more fuses before I realized what was happening.

Geno

Title: Re: Help! Valve Art 274B Failure
Post by 2a3smith on 02/18/19 at 05:18:16

Spent the day on our home remodel project and didn’t get to open the amp today. I’ll get to it tomorrow morning and let you know what I find. Your assistance is much appreciated!

On a side note, what’s the best way to list your system parts and pieces on forum posts the way you guys have done it?

Title: Re: Help! Valve Art 274B Failure
Post by Geno on 02/18/19 at 13:31:45

Go into My Center. Select Profile. Then Options. In the Signature box, type in what you want. Save at bottom.

Title: Re: Help! Valve Art 274B Failure
Post by 2a3Smith on 02/18/19 at 23:33:01

Thanks Lon and Geno!

Three fuses sit directly below the rectifier tube socket in the Torii Jr. The one feeding the OA3’s had blown. Back in business now!

Doug

Title: Re: Help! Valve Art 274B Failure
Post by Lon on 02/19/19 at 00:43:43

Great news Doug!

Title: Re: Help! Valve Art 274B Failure
Post by Geno on 02/19/19 at 04:06:08

Glad to hear that you’re back on track!

Title: Re: Help! Valve Art 274B Failure
Post by Colin B on 02/20/19 at 05:31:59

Nice! What size/rating are the fuses? I like to keep a collection of spare parts in case things go wrong.

Title: Re: Help! Valve Art 274B Failure
Post by 2a3Smith on 02/26/19 at 04:26:23

The bad fuse was 5 amp. I didn’t pull the other two fuses, but one of them looked to be quite hefty....kind of looked like a wrapped guitar string.

Title: Re: Help! Valve Art 274B Failure
Post by Colin B on 02/26/19 at 17:05:08

Cool, thanks. I've got a few of those laying around so I should be good. The heavy wound two are slow-blow fuses, probably of a similar rating.