OK guys thanks for the input. It seems that circa 05 and 06 Sovtek 5AR4's have very short life spans. It is sad as I have used Sovtek 5AR4's for nearly 17 years without a problem and would routinely get 6 or 7 if not more years of use out of them. I spoke to Otto at Sovtek/New Sensor and reports no increase in failures of that tube he wasn't convincing to me as I see many failures.
I have switched to JJ 5AR4's since the begining of the year and ( fingers crossed ) haven't had any rectifier failures to date with them.
It's funny to because most reprorted failures are on MAZ JR's, which has a low input capacitance 40 uF well under max rateing, and total currant draw of the Jr is under 100 mA and true 5AR4's are rated at 250mA max.
Good luck with the tube search Doc. I really appreciate the fact that you have taken time to consult with your customers on this issue in order to deliver the best amp you possibly can. How many other amp companies would do that. Luckily, I haven't experienced one of these problems, but it is very comforting to know that the man behind the amps is digging into this type of issue. Thanks Doc!
Post by Stylemaster on Sept 11, 2007 13:15:53 GMT -7
1 ) Have you blown a HT fuse ? I blew both fuses. 2 ) Was the rectifier the the cause ? Yes. Watched it spark before new fuses blew. 3 ) What model Z was it ? Maz Sr. Reverb Head 4 ) Circa of amp or serial number ? Q - 2006 model 5 ) Type of rectifier and date code at bottom of tube ? Sovtek
Replaced the rectifier with an OS (Old Stock) GE GZ34 - the original from my '64 Tremolux which my amp tech said was still good. Maz sounds like new amp now. And, most importantly, it works!
GuitarZ: I'm okay with the AARP letters. You're still living and breathing? What the heck am I to think when a funeral home sends me a free consultation offer? Ouch!
Jun 21, 2019 15:41:26 GMT -7
The Bad Poodle: I bought airline tickets online... now every few days i get emails that read "Your trip is almost here but aren't you forgetting something?? You don't have trip insurance!" and i'm thinking..."is there something i should know about your plane maintenance?"
Jun 21, 2019 16:02:32 GMT -7
GuitarZ: Reminds me of buying my Honda. When they tried to sell me the maintenance package, I said "Is your car not reliable?" Long story short my wife teamed up with the sales lady to buy the maint package. Never again!
Jun 21, 2019 16:16:53 GMT -7
roscoenyc: I have never in my life experienced tube rattle. That said, I've only been playing electric guitar for 49 years.
Aug 2, 2019 6:39:37 GMT -7
The Bad Poodle: What cures tube SHAKE and tube RATTLE? A tube ROLL?
Aug 11, 2019 17:22:10 GMT -7
capofirstfret: I've experienced tube rattle in two different amps that I've had. In both cases I bought the rubber rings from Eurotubes and it fixed it for me.
Aug 14, 2019 12:57:35 GMT -7
roscoenyc: Guitar amps on carpet make me sad.
Aug 16, 2019 5:23:37 GMT -7
The Bad Poodle: Sunshine on my shoulders makes me happy, Sunshine in my eyes can make me cry
Aug 16, 2019 14:12:09 GMT -7
GuitarZ: Thank you for neighbors with gardens. Fresh veggies and no hassle!
Aug 17, 2019 18:12:08 GMT -7
"Z" Steve: Sunshine Superman? Call any vegetable - call it by name!
Aug 19, 2019 11:53:09 GMT -7
GuitarZ: Idiot! I wanted to put a little air on my Zoom H1's circuit board to clear out any residual Deoxit from spraying the input connector. Guess which can I picked up to spray. Yup! Not the air can.
Aug 23, 2019 10:07:40 GMT -7
premiumplus (Dave): I was wondering why a Frisbee gets larger the closer it gets. Then it hit me.
Aug 24, 2019 6:14:55 GMT -7