Tubes for EAR 834p - AVS Forum
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post #1 of 13 Old 03-05-2012, 06:20 PM - Thread Starter
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I have an EAR 834p phone preamp (with the ""Thorsten modification", if that matters) - I am beginning to experience some distortion which I'm thinking may be associated with a tube beginning to fail. There are three in the unit, all of them 12AX7 (ECC83). I admit knowing very little about the nuts-and-bolts of this.

I have two questions which I was hoping someone could help me with:

1) I know this is subjective, but what would be the "best" tubes to use as replacements, and where to obtain them? The ones that are currently installed are Telefunken ECC83/12AX7. The originals (I believe) which I also have are marked DPF (?) ECC83, two have the marking N8AN8, and one A9AN8.

2) What is a good new or used (via eBay, I suppose) tester for these? I'd be looking for something relatively inexpensive, as I don't currently own any other tube-based components (although I plan to get a couple of amps when I can). Understand too, I am unsure how to interpret the readings, so I will be back to ask about that, as well...

Thanks very much for any input.

- Mark
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post #2 of 13 Old 03-05-2012, 10:00 PM
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Telefunken 12AX7 ECC83's come in 2 versions smooth and ribbed plate. Smooth is the earlier version. Some of the best tubes ever made that can last you up to 10 yrs. Not cheap they run between $50 to $200 ea for NOS tubes. But w/their long life they should give you years of trouble free operation. Highly sought after just be careful who you buy from as there are alot of knock offs out there.
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post #3 of 13 Old 03-06-2012, 07:44 AM - Thread Starter
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Thanks, Class A - I know the Telefunkens are good but I don't know if my distortion problem is due to one of them - if they generally are good for 10 years, I'm probably at about that, age-wise - but they don't actually have many hours on them, and as I said, I don't have a tube tester.
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post #4 of 13 Old 03-06-2012, 08:26 AM
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Quote:
Originally Posted by chileboy View Post


2) What is a good new or used (via eBay, I suppose) tester for these? I'd be looking for something relatively inexpensive, as I don't currently own any other tube-based components (although I plan to get a couple of amps when I can). Understand too, I am unsure how to interpret the readings, so I will be back to ask about that, as well...

Thanks very much for any input.

- Mark

Good tube testers are expensive, require periodic calibration, and usually won't test the tubes in the operating conditions they experience in actual use. I thought about buying one of these boutique tube testers a while back, and still may if I can find a used one for sale.
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post #5 of 13 Old 03-07-2012, 05:24 AM
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alltubetesters.com Good article on a variety of tube testers.
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post #6 of 13 Old 03-07-2012, 05:56 AM - Thread Starter
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Quote:
Originally Posted by Class A View Post

alltubetesters.com Good article on a variety of tube testers.

Great, thanks - I was looking for a site like that. Much appreciated.

- Mark
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post #7 of 13 Old 03-07-2012, 09:00 AM
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This is the tube recommended to me by Kevin at Upscale Audio. Highly recommended for tubes and other components.

http://www.upscaleaudio.com/products...Old-Stock.html
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post #8 of 13 Old 03-07-2012, 11:17 AM - Thread Starter
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Quote:
Originally Posted by bhaaf View Post

This is the tube recommended to me by Kevin at Upscale Audio. Highly recommended for tubes and other components.

http://www.upscaleaudio.com/products...Old-Stock.html

Thanks for that - link doesn't work for me, but I found the ones you're referring to - $90 apiece, correct?

- Mark
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post #9 of 13 Old 03-08-2012, 06:04 AM
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Hey Mark,

Just a word of caution, they say that tubes actually sound their best right before they blow. Just be sure that that is your problem before you spring on a new set.
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post #10 of 13 Old 03-08-2012, 09:13 AM
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Quote:
Originally Posted by chileboy View Post

Thanks for that - link doesn't work for me, but I found the ones you're referring to - $90 apiece, correct?

- Mark

Or $100 for Platinum Grade and $8.00 for Cryo if you want.
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post #11 of 13 Old 03-09-2012, 06:45 AM - Thread Starter
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Originally Posted by Maceo23 View Post

Hey Mark,

Just a word of caution, they say that tubes actually sound their best right before they blow. Just be sure that that is your problem before you spring on a new set.

Yeah, I have the originals from the unit - I am going to try swapping them out this weekend and see if there is a difference.
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post #12 of 13 Old 03-09-2012, 06:46 AM - Thread Starter
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Or $100 for Platinum Grade and $8.00 for Cryo if you want.

Is the Cryo worth getting?
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post #13 of 13 Old 03-09-2012, 02:57 PM
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Quote:
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Is the Cryo worth getting?

Tubes should be heated in induction oven, rather than cooled in the feezer, to work better.
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