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Woo WA2 Tube Rolling Recommendations - Page 26

post #376 of 388
Does anyone here have Telefunken 6922s? If so, would you mind writing a review--I mean specifically paired with the WA2? I've had my eye on these for months, but can't seem to decide: http://www.upscaleaudio.com/telefunken-e88cc-6922/. I've read that they're even better than my beloved Amperex 7308s. Thanks.
post #377 of 388

Those Telefunken's are amazing. Expensive tho. Here is a link where you can buy them: http://www.upscaleaudio.com/telefunken-e88cc-6922/

 

I just ordered some EZ80 6V4 Valvo Hamburg West Germany, and  AMPEREX 6922 E88CC 7LG GOLD PIN NOS VINTAGE 1962 4 VALVO​. 

 

 

 

Anyone have experience with either of those? 

post #378 of 388

Hey, guys. I'm new here. I have a question. I want to buy some tubes for me wa2 on ebay, maybe a pair of 5998 or 6AS7G. but how can I tell if they are matched? Can I test their matched status by myself? Because some sellers just say matched pair. but how can i tell if they are telling the truth?

thanks

post #379 of 388
Quote:
Originally Posted by paladinm View Post
 

Hey, guys. I'm new here. I have a question. I want to buy some tubes for me wa2 on ebay, maybe a pair of 5998 or 6AS7G. but how can I tell if they are matched? Can I test their matched status by myself? Because some sellers just say matched pair. but how can i tell if they are telling the truth?

thanks

Speaking for myself as long as the tubes are the same brand and look alike and test similar its good enough for me but some may see things differently 

post #380 of 388

Thank you for your reply. But about "test similar", how can I test them? 

post #381 of 388
Quote:
Originally Posted by MIKELAP View Post
 

Speaking for myself as long as the tubes are the same brand and look alike and test similar its good enough for me but some may see things differently 

For example, I saw a pair of tubes on ebay. The seller says

 

Tube 1 Results
106 ma - 16 ma
105 ma - 16 ma


Tube 2 Results

106 ma - 16 ma
105 ma - 16 ma

 

Are these the results I should look at?

If yes, what do they mean? Can I measure them by myself?

Thanks~~~

post #382 of 388
Quote:
Originally Posted by paladinm View Post
 

For example, I saw a pair of tubes on ebay. The seller says

 

Tube 1 Results
106 ma - 16 ma
105 ma - 16 ma


Tube 2 Results

106 ma - 16 ma
105 ma - 16 ma

 

Are these the results I should look at?

If yes, what do they mean? Can I measure them by myself?

Thanks~~~

They seem to be very similar you want to see how much life is left in them ,some say this with a percentage for example  tube tesT at 90% and minimum good value would be 60% others test results are shown in microohms and they have to be tested for shorts and gas leaks also just read the add usually all the infos is there .

post #383 of 388
Quote:
Originally Posted by MIKELAP View Post
 

They seem to be very similar you want to see how much life is left in them ,some say this with a percentage for example  tube tesT at 90% and minimum good value would be 60% others test results are shown in microohms and they have to be tested for shorts and gas leaks also just read the add usually all the infos is there .

Thanks.

Can I test them by myself? I wonder how did they get those test results? What equipment do they use?

post #384 of 388
Quote:
Originally Posted by paladinm View Post
 

Thanks.

Can I test them by myself? I wonder how did they get those test results? What equipment do they use?

if you have a tube tester you can depending on the tubes you have theres lots of different types   this is one of them                                                                                                                              

post #385 of 388
Quote:
Originally Posted by MIKELAP View Post
 

if you have a tube tester you can depending on the tubes you have theres lots of different types   this is one of them                                                                                                                              

Sooooo, if a pair of tubes are of the same brand, look alike and in good condition, and tested as having the same/close percentages (like 90% and 90%), they will draw similar currents and be considered as a matched pair? 

post #386 of 388
Quote:
Originally Posted by paladinm View Post
 

Sooooo, if a pair of tubes are of the same brand, look alike and in good condition, and tested as having the same/close percentages (like 90% and 90%), they will draw similar currents and be considered as a matched pair? 

Same brand same style and also have to test the same electically in 6as7 tube theres is 2 triode section that are tested in the tube here's an example ,to be matched each section has to test within a certain percentage of each other to be called matched what that percentage is  i dont remember but i would guess would be about 5% difference  between the 2 triode   like in picture  .Hope this helped                                                                                                                                                                                                                              

post #387 of 388

Woa, many thanks...really helped. I also have some other questions

do preamp tubes and rectifier tubes need to be matched?

what will happen if i use unmatched power tubes? will mi amp explode?

post #388 of 388
Quote:
Originally Posted by paladinm View Post
 

Woa, many thanks...really helped. I also have some other questions

do preamp tubes and rectifier tubes need to be matched?

what will happen if i use unmatched power tubes? will mi amp explode?

Some amp configuration i heard need tubes to be matched  but in my case i have a Littledot mk3 i dont buy matched tubes because imo its waisted money its a scam for vendors to sell there tubes more ,i also have a WooAudio 2 i dont have matched tube on that amp either and nothing exploded yet .With my Littledot at first i use to buy matched power tubes but i also use tubes that are not matched and i dont have any problems and i have had that amp for over 2 years .When i buy tubes i want same brand and same type structure and ive been happy with that and i probably  saved a ton of money by doing so.

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