Forums - Print Page

Forums
https://www.decware.com/cgi-bin/yabb22/YaBB.pl
EQUIPMENT FORUMS >> ZP3 / ZMC1,2,3 >> Used a 5Y3GT in the ZP3 & the OA3 flared up
https://www.decware.com/cgi-bin/yabb22/YaBB.pl?num=1424742516

Message started by Greg12 on 02/24/15 at 01:48:36

Title: Used a 5Y3GT in the ZP3 & the OA3 flared up
Post by Greg12 on 02/24/15 at 01:48:36

Wondering why the OA3 reacted like that. The ZP3 came w/ a Valve Art 274B and fired up fine. I swapped the 274B out w/ a Philips 5R4GY and also fires up fine. Well today I tried a 5y3GT that I'd used in my Torii III previously with no probs, but in the ZP3 it made the OA3 light up in multi colors and it looked like an inferno inside the tube. I stared mesmerized at the pretty colors for 3 seconds or so until my Ninja reflexes kicked in and I shut the amp off. :P I put the Philips back in, no prob.

From the literature and posts here it seems the 5Y3GT is approved for this phono amp. Sure didn't look like it tho.

Has anyone else seen this happen? Hopefully it doesn't shorten the life of the OA3

Greg

Title: Re: Used a 5Y3GT in the ZP3 & the OA3 flared up
Post by Lon on 02/24/15 at 01:55:34

I've been using 5Y3GT in my ZP3 since day one and have kept it in whenever I've tried another tube type, and with no problems like that with the OA3. Could be the OA3 is feeling its age? There are a lot of them out there . . . . I'm using an old Mullard now that seems very stable and imparts a nice neutral to warm sound. . . .

Title: Re: Used a 5Y3GT in the ZP3 & the OA3 flared up
Post by mark58 on 02/24/15 at 01:58:12

I use a 50's 5Y3G in my ZP3 without a problem since day one. The ZP3 was voiced with the 5Y3 type rectifier when Steve developed it. I think it may be the tube not the type. Mark.

PS...I hadn't thought of that...Lon might be right. The OA3 might be the problem.

Title: Re: Used a 5Y3GT in the ZP3 & the OA3 flared up
Post by Greg12 on 02/24/15 at 02:02:37

Yeah maybe, It hadn't seen much service since I'd replaced it way back when in the Torii w/ an OB3 which saw the most use. In fact the OA3 is what came w/ the Torii back in 2013 so should'nt think it would be worn out or faulty, expecially since I only use 5Y3Gt's in the Torii. And why it works fine w/ the other 2 rectifier types is beyond me. I'm at work tonight, so can't experiment until the am. I guess I'll try a different 5y3gt with it. If I get the same results I'll try the other OA3 that came w/ the Torii.

Title: Re: Used a 5Y3GT in the ZP3 & the OA3 flared up
Post by Archie on 02/24/15 at 02:03:25

I've used a NOS RCA 5Y3GT, Ruby 5U4G and a Valve Art 247B with no OA3 issues in my ZP3.

Title: Re: Used a 5Y3GT in the ZP3 & the OA3 flared up
Post by Greg12 on 02/24/15 at 14:22:41

Well this morning I turned the gear on for 20 mins then shut the zp3 off and put the 5y3gt in with no trouble. As I hadn't marked which of the 2 identical ones was used yesterday I shut it down and popped the other 5y3gt in. Flare up. Hmm. Bad 5y3gt?. Waited 2 mins and turned the ZP3 back on. This time it started up fine. So I don't know. At any rate it may be a moot point because I listened a bit and determined that the sound with the 5y3gt while nice and orderly, seemed too polite. Not enough low end. I have the Philips back in now and really love the life it brings. Bass is stronger and really detailed.

I still run the 5y3gt's in my Torii so maybe having them also in the ZP3 is too much of a good thing in the bass control department. Too tame a sound for me.

Title: Re: Used a 5Y3GT in the ZP3 & the OA3 flared up
Post by attym on 02/25/15 at 14:50:43

I found I much preferred the 5y3GT over a 5u4g... and Ive never had flare ups.

Title: Re: Used a 5Y3GT in the ZP3 & the OA3 flared up
Post by Acetone on 02/25/15 at 18:12:57

have tried 274B, 5U4GB, 5R4GYS, 5Y3GT, 5C3S rectifiers without any change to the 0A3 performance....it just blinks a handful of times at shut down. Will be trying a 0C3A soon.

Title: Re: CSP3 as a Pre-amp
Post by stoutblock on 03/21/15 at 02:50:18

mine does not like 5R4G tubes. The OA3 has a fit.