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March 24, 2019, 06:19:16 am

Author Topic: Just finished my S.E.X. 3.0  (Read 178 times)

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Offline ejb14

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Just finished my S.E.X. 3.0
« on: March 13, 2019, 04:05:55 am »
And wow - what a difference over the stock headphone amps in my solid state preamps. Really enjoying this!

This question has probably been answered already, but where would I buy replacement tubes? 6FJ7's - sorry, new to tube amps in general and just want to make sure I get quality replacements. I would like to buy a couple of sets to ensure I have some on hand in case one gets blown or wears out. Also, I noticed the two that came with the kit are not the same brand (GE and RCA) - I take it they don't need to match?

Thanks!

(added some pics - came out real nice, thanks to terrific instructions!)
« Last Edit: March 13, 2019, 06:44:40 pm by ejb14 »

Offline Paul Birkeland

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Re: Just finished my S.E.X. 3.0
« Reply #1 on: March 13, 2019, 05:48:25 am »
Most tube dealers should have some 6FJ7s laying around, though they may not list them.  There also should be some available on eBay (do not buy or pay attention to the prices from Bangy Bang Tubes). 

The printing on the tube is just a label, do the internals of the tubes match?
Paul "PB" Birkeland

Bottlehead Grunt & The Repro Man

Offline ejb14

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Re: Just finished my S.E.X. 3.0
« Reply #2 on: March 13, 2019, 07:38:10 am »
I think they match yes - just looked at some pictures I took on my phone and they appear to have the same insides..I will take a closer look when I get back home after work today.

Thanks for the tip on Ebay! "Most tube dealers" - do you have any specific sources you could recommend - perhaps where you got the ones from my kit :) I am finding a few online like tubedepot (out of stock) and the tube store (just says 'assorted brands in stock'). I am just hoping to get a tube that is either new/old stock and unused or at least guaranteed to be up to specification. I don't want to put in something that will hurt this beautiful amp.
Thanks again!

Offline Paul Birkeland

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Re: Just finished my S.E.X. 3.0
« Reply #3 on: March 13, 2019, 07:41:11 am »
You are going to find that most 6FJ7s available are nos.  I would order from vacuumtubesinc.com.
Paul "PB" Birkeland

Bottlehead Grunt & The Repro Man

Offline ejb14

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Re: Just finished my S.E.X. 3.0
« Reply #4 on: March 13, 2019, 08:24:13 am »
Excellent thanks - and thanks again for the Bangy Bang tubes warning - they have lots of 6FJ7's available and 100% positive reviews on Ebay. I would have definitely ordered from them otherwise.

Thanks for the tip on vacuumtubesinc.com too - I will buy from them.

Offline ejb14

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Re: Just finished my S.E.X. 3.0
« Reply #5 on: March 13, 2019, 09:18:49 am »
Sorry for all the questions - is there an Frequently Asked Questions thread for the S.E.X. kit?

For instance, I understand that the lifespan of the tube may be circuit dependent, so was wondering how long I should expect the S.E.X. kit tubes to last. I see a general 500 to 1000 hours for tubes in general.

Thanks again for all your help!

Offline Tom-s

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Re: Just finished my S.E.X. 3.0
« Reply #6 on: March 13, 2019, 09:30:29 am »
I wouldn't be surprised for a tube to survive 10.000-100.000 hours in a good circuit.
Don't worry about it. It will take you a few years of continues amp-on time to get them to run out.

In some manufacturers data sheet for long life tubes (at least >10.000 hours), they do make a statement that this is under condition's where a tube doesn't get more than 12x on/off every 24 hours. So switching an amp on and off a lot might influence tube life.

Offline Paul Birkeland

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Re: Just finished my S.E.X. 3.0
« Reply #7 on: March 13, 2019, 10:07:16 am »
For instance, I understand that the lifespan of the tube may be circuit dependent, so was wondering how long I should expect the S.E.X. kit tubes to last. I see a general 500 to 1000 hours for tubes in general.
I have a similar amp running in my shop with a slightly different (but very similar) Compactron tube.  I think I got about 5 years of constant operation before they started sounding funky, which is about 40,000 hours.
Paul "PB" Birkeland

Bottlehead Grunt & The Repro Man

Offline ejb14

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Re: Just finished my S.E.X. 3.0
« Reply #8 on: March 13, 2019, 11:48:30 am »
Great - thanks again for all your help! Much appreciated!
-Ed

Offline Karl5150

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Re: Just finished my S.E.X. 3.0
« Reply #9 on: March 14, 2019, 04:31:54 am »
Nice, clean build. Enjoy the S.E.X. There is something magical about these little amps.
Karl
Analog: Planar3>Eros>Stereomour II>Tekton OB4.5 & DIY "S8" subs
Digital: CD5004>Quickie>Seductor>FH3
Office: Schiit Modi Uber 2/Sirius Tuner>SEX 2.1.1>µFonken/FF85WK