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PostPosted: Mon, May 24, 2010 10:13am 
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What are you guys using for your tube combo's? I have a herbert with all 6L6' and liking it but wondering what I can get out of KT 88's or EL 34's?

I've never had anything other than 6L6's in it, so that is why I am asking.

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:rock:

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PostPosted: Mon, May 24, 2010 12:27pm 
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i have used about 50 different combos. (all EL34, all 6L6, all KT77, all KT88, all 6550, El34 & 6L6 mix, 6550 & EL34 mix list goes on...) currently my ears are digging 4 6550s & 2 EL34s. Really kills it!!! Also dug all 6550s in the Herbie.

Best of luck! :lol: :LOL:

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PostPosted: Mon, May 24, 2010 1:02pm 
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PaulyPanacea wrote:
i have used about 50 different combos. (all EL34, all 6L6, all KT77, all KT88, all 6550, El34 & 6L6 mix, 6550 & EL34 mix list goes on...) currently my ears are digging 4 6550s & 2 EL34s. Really kills it!!! Also dug all 6550s in the Herbie.

Best of luck! :lol: :LOL:


Pauly - Anything specifically? How are you biasing the amplifier, and what brand tubes are you using?

Last thing, are 6550's similiar to KT88's and are the 6550's stable for the amplifier?

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PostPosted: Mon, May 24, 2010 2:05pm 
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Finally we don´t recommend 6550´s and KT88.
It causes too much heat at the right bias point.

But You guys will know it better ;)


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PostPosted: Mon, May 24, 2010 3:03pm 
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Peter Diezel wrote:
Finally we don´t recommend 6550´s and KT88.
It causes too much heat at the right bias point.

But You guys will know it better ;)



What do you reccomend? :D

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PostPosted: Mon, May 24, 2010 3:38pm 
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FixXxer wrote:
Peter Diezel wrote:
Finally we don´t recommend 6550´s and KT88.
It causes too much heat at the right bias point.

But You guys will know it better ;)



What do you reccomend? :D


The search is your friend... ;)

viewtopic.php?f=14&t=68254&hilit=output+tube

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PostPosted: Mon, May 24, 2010 7:26pm 
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[/quote]

The search is your friend... ;)

viewtopic.php?f=14&t=68254&hilit=output+tube[/quote]

Brother, I love searching but the way search results are displayed on this board is pretty weak. Some of the other boards have better display results.

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PostPosted: Mon, May 24, 2010 8:47pm 
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FixXxer wrote:


The search is your friend... ;)

viewtopic.php?f=14&t=68254&hilit=output+tube[/quote]

Brother, I love searching but the way search results are displayed on this board is pretty weak. Some of the other boards have better display results.[/quote]

Yeah, just giving you a hard time, bro! ;)

I asked the same question a couple weeks ago and was surprised that Peter doesn't want people to use 6550s when I have seen so many people using them. I personally think that 4 El34s and 2 6550s sound best, at least they do in my Herbert. I tried a bunch of different combinations and settled on that one. :thumbsup:

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PostPosted: Tue, May 25, 2010 8:05am 
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Papa is right..as always. They are HOT! I run a small fan in the back to keep good air circulation. I know Papa loves the Ruby EL34BHTs for his babies. I just cant get past how good the 6550s sound. Just my opinion.

I have been using SED Winged C Tubes religiously in my Diezels for the past few years with ZERO issues. I biased to the orig #s Papa had posted ( 90 to 100mA/ pair on the 6550 & 32 to 35mA on EL34s)

KT88s sound like a hopped up EL34 & the 6550s sound like a hopped up 6L6..to my ears. Preferred the 6550 to the KT88s.

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PostPosted: Mon, Oct 13, 2014 10:45am 
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So you guys running kt88 and 6550 tubes do your amps still work? Was a joke . I have three quads of kt88 and two quads of 6550 tubes I'm dying to mix in the Herbert mk2. I find it hard to believe the transformer can't Handel it. Peter says the amp can't Handel it . I wonder what part of the amp he means?

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PostPosted: Wed, Nov 28, 2018 6:53am 
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PostPosted: Wed, Nov 28, 2018 1:34pm 
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I’ve tried a lot if different combinations as well. Most types except all KT88.
I find the power section of Herbert very clean, to an extreme compared with the VH4.
With very clean tubes ( little harmonics & overtones ) it gets flat and a bit anemic.
These are all based from my personal tone point of view.

I didn’t like any 6L6’s in it. I love 6L6’s in the VH4 , the amps are that different in how the power section works.
Same goes for GL KT77 , just too clean. I do like these a lot in the VH4 and other amps.

The SED 6550’s are good. Dynamics to the extreme. It makes the amp very full & powerful sounding.
Not much in the way of offensive frequencies. Nor does it have that Marshall bite that I like.

The current recommended JJ KT77 is IMHO a good tube.
Also dynamic, and full but not to the extreme amount that the SED 6550 is.
It has A Lot of low end and low mids. , so much so that almost chokes the amp. I find I need to roll back the deep and use mid cut to get a sound I like.
There’s a frequency that my ears don’t like in the JJKT77 , they seem a little bit unmusical.
The amp doesn’t squish much with these.

JJ el34L is a good tube , my second favourite.
There’s some squish and a more traditional Marshall like eq to the amp.
Cleans are ok but not great.

Ruby / TAD el34 bstr.
My favourite tube in the Herbert.
Dynamic while retaining a more Marshall flavour.
The attack seems to bloom and build. As opposed to the tightness / on-off response of the KT77’s.
Cleans are also beautiful.
Honestly I didn’t get the Herbert hype until I tried this tube.

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