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August 12, 2020, 10:05 PM #1Junior Member
- Join Date
- Jul 2020
- Location
- Shoreline, WA
- Posts
- 15
Expected working life of 845 tubes
All
I just bought an 845 based (used) SET amp and it came with a small collection of somewhat used 845 tubes (I think the seller said low hundreds of hours) so I was curious about what the expected life of these tubes is. I'm fairly clueless about tube amps as I have mostly used SS amps until now (except for an amp for Stax headphones). In general, how does one know when the tubes are nearing their useful life? This amp also uses a couple of 845 tubes for voltage regulation and the manual recommends that they need to be matched to avoid hum. I assume I will need a tube tester to ensure matching?
Thanks from a tube newbie!
Anil
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August 13, 2020, 08:36 AM #2Senior Member
- Join Date
- Feb 2016
- Location
- west Michigan
- Posts
- 713
Re: Expected working life of 845 tubes
Most, if not all, of the "common" tube testers are not capable of testing an 845 tube.
There are several companies that offer a testing service for them.
Also several youtube vidios for building a tester for these power tubes.
As for life expectancy, can't provide any info there.My System
Acoustic Revive RTP-4
Innuos Pulsar
Lampizator BALTIC4
Cary SLP-05
Pass XA30.5 or
Line Magnetic 845ia
Reference 3A Reflector's
Pr SVS SB3000 Subs
Cables & Tubes "subject to change without notification".
Complete system on battery power/solar
Core Audio Design Rack
DIY bass traps and custom curved diffusors.
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August 13, 2020, 05:25 PM #3Junior Member
- Join Date
- Jul 2020
- Location
- Shoreline, WA
- Posts
- 15
Re: Expected working life of 845 tubes
Thanks, I will follow up on testing services for future reference. All the tubes are new enough that this is not an immediate concern, but I was curious about how to tell when they're getting old.
As for building a tester, given that I can barely solder, I will not trust myself to build a tester for high power tubes :-)
Anil
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August 13, 2020, 05:41 PM #4Senior Member
- Join Date
- Feb 2016
- Location
- west Michigan
- Posts
- 713
Re: Expected working life of 845 tubes
Smart move.
Knowing one's limitations can prevent many disasters.
Enjoy your new gear.My System
Acoustic Revive RTP-4
Innuos Pulsar
Lampizator BALTIC4
Cary SLP-05
Pass XA30.5 or
Line Magnetic 845ia
Reference 3A Reflector's
Pr SVS SB3000 Subs
Cables & Tubes "subject to change without notification".
Complete system on battery power/solar
Core Audio Design Rack
DIY bass traps and custom curved diffusors.
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AudioShark forum is a leading forum site for High End Audio Discussion, Stereo System Discussion, Home Theater System Discussion, Best Home Stereo System Discussion, Home Theater Installation Discussion etc.
The AudioShark forum was created for sharing the passion of high-end Audio. We have Audiophiles from all over the world participating and sharing their knowledge. From novice to experts, you will find a friendly environment for discussing about High End Audio, Stereo System, Home Theater System, Home Stereo System, Home Theater Installation, Amplifiers, Speakers, Subwoofers, Integrated System, Acoustic treatments & Digital Room Corrections and many more.
At AudioShark, we also have incorporated an exciting Marketplace where members can peruse terrific buys on used gear, as well as meet dealers and discuss the purchase of new gear.
We are as crazy about this hobby as you are! So come on in and join us! Audioshark.org the Friendliest Audio Forum!
Industry Participation Disclosure : The owner and administrator of Audioshark is the owner of Suncoast Audio LLC in Sarasota Florida. Suncoast Audio has a full brick and mortar presence in Sarasota with several great show rooms with many world class brands. More information can be found at http://www.suncoastaudio.com
Audioshark is a community of like minded individuals. Audioshark welcomes participation from all manufacturers and owners of all brands and products. It is our belief that online forums provide a community of like minded audiophiles and music lovers to encourage the growth of this wonderful hobby.
Sincerely,
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