Also, I've noticed with the Herbert that I need to go back and check it a week or two after setting the bias as it can wander a little immediately after being set - hope some of this helps and let us know how you get on! so it's always a good idea to bias your amps once or twice a year. In terms of the bias wandering as you touched on this can happen over time, movement of the amp etc. Happy to be corrected on any of this - I've not owned a VH4 since 2008 and, although I want a Hagen, I've never owned one of those either However my Herbert (which is pretty new) has pretty clear instructions on the PCB (I think from memory near the trim pots for the bias). It's worth noting that these instructions are not up to date for the latest Herbert's and that may be the case for the Hagen's too. In terms of what you do then it varies by amp the VH4 guide is here:Īnd the Hagen I *think* is like biasing the Herbert and there are some instructions here:
Sometime I ask to have other opinions too, not only because I don't know anything.My understanding is that it is mainly the capacitors that can be the issue in terms of remaining charge - to drain then you need to turn the amp off with out switching it to standby, this should do the job (PS - if anyone has better way please chime in!). But if experience say not to buy that tube today for some reason, I can think a little more just before to get what I like only because I like it. I read this forum for years, I know initially the el34 was used and suggested by Peter, in fact that tube is still in my amp. Even if with el34 I've never had a single problem ! Then it is not I don't want to experiment.simply, I care of my amp and if the person who built it suggests not to use anymore a certain tube. I asked again just to be sure, amazed after reading 50mA for the single kt88 tube Ps: I saw the word "single" anyway, you know. Questions have the purpose to see other point of views, not to see written the one and only truth. You take the matter too seriously, see the smiles here and there? Yo! I think you have had a wrong conclusion. There's an old wise Spanish axiom that goes "El tesoro de un hombre es la basura de otro hombre". Quite frankly, unless you're exclusively a studio recording guitarist, then in a live performance the audience (9:10) won't notice any difference relating to what has been discussed here. It has been constructed, tested, deconstructed, rebuilt more times than you or I could possible fathom and now you're wrangling over a $15-20 part! A part that the OEM has spent countless hours scrutinizing and concluding what is best sonically for his creation.įor the amount of $ that was invested in purchasing this fine guitar amplifier one would think that the notion of acquiring three matched sextets of E元4, E34L and KT77 PTs for a conclusive testing purpose wouldn't break the bank! If this simple effort will break the bank, then one is not prepared to invest in a Diezel guitar amplifier.
Therefore the obvious next point might be: You've paid dearly for a wonderful piece of guitar equipment that has been designed by a brilliant audio engineer. However you won't acquire this masterfully engineered piece of guitar equipment without paying for it. It's simple, effective and built to last a lifetime while one hones in and continue to take pleasure in their musical aspirations. You've a superb guitar amplifier, and in my opinion one of if the finest hand crafted/built guitar amplifiers available for public consumption.
Bias amp 2 back sabbath Pc#
I should have initially tried a PC = 41 with a TC = 3169. Possibly the following week you may think to yourself "self, maybe I was all wrong and I need to re-examine my logic here. Or the next day or two you may prefer a PC = 32 with a TC = 2780. You may prefer a PC = 51 with a TC = 3550. As in what may be the most "preferable" plate current (PC) and transconductance (TC - the reciprocal of resistance) of your PT. If you'd like to spin yourself into more minutiae, then I suggest you begin to furthermore contemplate and ponder the grade or the rating of the PT. I still have five sextets of them and I use them to this day as backups quite frequently when waiting for JJ PT replacements. This PT is a very fine PT, stands the test of time, performs and sounds fantastic in any Diezel Herbert. More than four (and more) years ago the "best" (recommended) PT for the Diezel Herbert was the Ruby E元4B-STR. There's no need to "fear" anything about the testing and gaining knowledge over a "personal" observation and the outcome of a PT's performance. I will add they are common PT types that are easily accessible by many different vendors worldwide. You speak here of three power tube (PT) types. Click to expand.I truly believe that you're spinning yourself out of complete control at this point over frequent minutia regarding this subject matter.
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