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 Post subject: Tubes for Herbert
PostPosted: Sun, Nov 13, 2016 5:43am 
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Hack

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Hey guys, I need a bit of help with my Herbert (mark I, 2009). I was experiencing some sudden volume drops and the sound wasn't as good as before. I suspected the power tubes since they're now about 5 years old. Then I found out that also one of the pre-amp tubes has cracked. Ideally I would've sent the amp to a tech but I'm in Taiwan and techs are nowhere to be found. So I ordered the Shuguang tube set with 6L6's for the Herbert. Now, I'm a noob at this and this is probably a very stupid question, but the set has 14 tubes. I counted 6 power tubes and 6 pre-amp tubes, where do the other 2 tubes go?
Also, I casually measured the bias with me newly acquired meter and the current E34's are biased at about 48mA. Isn't that a bit low?

Any help welcome, thanks!


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 Post subject: Re: Tubes for Herbert
PostPosted: Sun, Nov 13, 2016 2:45pm 
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So these are the tubes that are included in the Shuguang tube set:
Image[/URL]


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 Post subject: Re: Tubes for Herbert
PostPosted: Sun, Nov 13, 2016 6:59pm 
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This list of tubes is not correct.
If you want 6L6's in the power section ..

It should be
6 x 6L6 (power tubes)
6 x 12ax7 (preamp tubes)

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 Post subject: Re: Tubes for Herbert
PostPosted: Mon, Nov 14, 2016 1:46pm 
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IntenseSH wrote:
So these are the tubes that are included in the Shuguang tube set:
Image[/URL]



This is what they sent you???

That is a random mix. Half of them are power.tubes and singles at that. Wtf.

Herb had 6 power 6l6/kt77 and six 12ax7

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 Post subject: Re: Tubes for Herbert
PostPosted: Tue, Nov 15, 2016 1:39am 
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I have ordered the set but haven't received it set. Found other tube Herbert tube sets at Rototube and they all seem to have the same kind of tubes:

Image

Image

Image

Anybody know how this works?


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 Post subject: Re: Tubes for Herbert
PostPosted: Tue, Nov 15, 2016 4:06am 
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This is all nonsense. Our current stock tubes:

6 x KT77-JJ power tubes
1 x 12AX7B-C Highgrade or Mullard Reissue CV4004 for V1
5 x 12AX7B-C for V2, V3, V4, V5, V6.


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 Post subject: Re: Tubes for Herbert
PostPosted: Tue, Nov 15, 2016 4:30am 
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Hi Peter, this is all rather confusing.... guess i could replace the current Ruby E34's with the Shuguang 6L6's? Will the Shuguang 12AX7-SG work in V4? The current one in V4 has cracked and needs to be replaced.


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 Post subject: Re: Tubes for Herbert
PostPosted: Tue, Nov 15, 2016 9:50am 
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You can replace the V4 with the Shuguang.

Btw, the 12AX7B-C are also from Shuguang.

Best,
Peter


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 Post subject: Re: Tubes for Herbert
PostPosted: Wed, Nov 16, 2016 5:30am 
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Thanks Peter. Just one last question, what is the difference between a balanced 12AX7B for the phase inverter and a normal 12AX7B? Are they interchangeable?


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 Post subject: Re: Tubes for Herbert
PostPosted: Tue, Dec 27, 2016 6:10am 
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Guys, i live in Holland. Any shops you found in the EU where i can find the V1 12AX7B-C Highgrade?
I found a shop that has a GT 12AX7-C , would this be ok in the V1?

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 Post subject: Re: Tubes for Herbert
PostPosted: Tue, Dec 27, 2016 7:38am 
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If you google "12AX7-B C" there is only one hit: this thread.

http://lmgtfy.com/?q=%2212AX7B-C%22

Google only knows 12AX7B without the C.
Peter seems to like recommending tubes that can not be googled. :lol: :LOL:

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 Post subject: Re: Tubes for Herbert
PostPosted: Tue, Dec 27, 2016 8:10am 
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Maybe these: 12AX7-B759-CV4004
No, these appear to have lower gain.

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 Post subject: Re: Tubes for Herbert
PostPosted: Tue, Dec 27, 2016 8:41am 
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well i found a dutch shop with a Shuguang 12AX7B/ ECC83 HIGH GAIN premp tube for the V1 and
Shuguang 12AX7B/ ECC83 (not high grade)for the others.

I think this should be ok :confused:

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 Post subject: Re: Tubes for Herbert
PostPosted: Tue, Dec 27, 2016 9:15am 
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https://www.btb-elektronik.de/artikel/521395

https://www.btb-elektronik.de/artikel/521394

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 Post subject: Re: Tubes for Herbert
PostPosted: Wed, Dec 28, 2016 2:55am 
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Its been many years i did a retube.

Do the other preamp tubes need to be balanced?

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 Post subject: Re: Tubes for Herbert
PostPosted: Wed, Dec 28, 2016 7:27am 
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Since Peter did not mention it, I suppose it is not necessary.

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 Post subject: Re: Tubes for Herbert
PostPosted: Thu, Dec 29, 2016 6:58am 
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Peter mailed me and i orderd:
V1 Mullard 12AX7 / CV4004
V2 Shuguang 12AX7B/ ECC83 HIGH GAIN
V3/V6 Shuguang 12AX7B/ ECC83

Soon ill order 3 sets of KT77

Thanks for all the help guys

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 Post subject: Re: Tubes for Herbert
PostPosted: Fri, Dec 30, 2016 4:23am 
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Where did you order?

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 Post subject: Re: Tubes for Herbert
PostPosted: Fri, Dec 30, 2016 4:47am 
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tonefactory.nl
The website is in german and english to.

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 Post subject: Re: Tubes for Herbert
PostPosted: Fri, Dec 30, 2016 5:01am 
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Thanks!
Did you order the higain cv4004?

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 Post subject: Re: Tubes for Herbert
PostPosted: Tue, Jan 03, 2017 5:39am 
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Yes i just checked the discription, its a high gain cv4004. Ill have to wait a bit, they dont have all in stock.

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 Post subject: Re: Tubes for Herbert
PostPosted: Wed, Jan 04, 2017 2:54am 
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Thanks! I'm wrecking one RT080 7025 WA TAD HIGHGRADE after the other in a matter of weeks. Tubes are really shitty these days.
Hope these are better and last a year or so.

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 Post subject: Re: Tubes for Herbert
PostPosted: Thu, Jan 05, 2017 5:38am 
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I know, thats why i always follow Peter's choice!
Cant wait till i do a full retube.

Goodluck

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 Post subject: Re: Tubes for Herbert
PostPosted: Thu, Jan 05, 2017 9:02am 
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You guys need to be on the lookout for some made in Germany vintage telefunkin tubes.
My D-moll has 6 of the on all the pre positions and it made everything I love about the amp even better. These were made in the 60's, I got them used form an old organ, they all test better than new production tubes and will prob last a lifetime. Your power tubes are fine with current production. Vintage power tubes are going for rediculous amounts. And good luck finding vintage kt77's

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 Post subject: Re: Tubes for Herbert
PostPosted: Fri, Jan 06, 2017 2:39am 
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Thanks for the tip, ill look in to it.

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 Post subject: Re: Tubes for Herbert
PostPosted: Fri, Mar 03, 2017 11:31am 
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I put gold lions in my Herbert in v1 and v6. I will be replacing v2 and v3 next. They are a little spendy but I think worth it and they sound amazing. :)


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 Post subject: Re: Tubes for Herbert
PostPosted: Sat, Mar 31, 2018 5:43am 
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I have a simple tube question. I'm looking to get Herbert MK1 off the internet. Normally I have the seller remove the power tubes when shipping it. I've bought a few boogies over the years and this is what I always had done as long as they were numbered properly. I should have any issues with the bias by just replacing the power tubes in their correct positions right?


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 Post subject: Re: Tubes for Herbert
PostPosted: Sat, Mar 31, 2018 10:52am 
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tzoranski wrote:
I have a simple tube question. I'm looking to get Herbert MK1 off the internet. Normally I have the seller remove the power tubes when shipping it. I've bought a few boogies over the years and this is what I always had done as long as they were numbered properly. I should have any issues with the bias by just replacing the power tubes in their correct positions right?


That should work fine.

:thumbsup:

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