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Post subject: HRD410 help
Posted: Thu Mar 14, 2013 12:09 pm
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Had this amp for around a year and I think I may have not treated it properly, sometimes I turned it on and after a few minutes turned the standby off and started playing not letting it warm up properly.
Anyway I'm fairly sure I blew one of the power tubes because it's black.
I'll be buying some new ones but I really have no idea when it comes to tubes because this is my first tube amp, I've seen a few brands mentioned (sovtek, svetlana, ehx) for tubes but any help would be great.
Also noticed something about biasing? I own a voltmeter but again not much experience there other than piecing together a few clone pedals.
Oh and for reference I play noise rock stuff with lots of pedals but I find the amp too loud so if there's power tubes that can bring the overall output down a bit that'd be cool, otherwise whatever will give me a nicer tone.
Thanks in advance for the help.


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Post subject: Re: HRD410 help
Posted: Thu Mar 14, 2013 8:45 pm
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Hi darbyday,

Did you like the sound with the stock tubes? If so, are they GT with a mid rating on the label (white 4 to 7), which might be Sovtek? Look for the original label in black lettering on the tubes. I am a GT fan, so I would stick with them myself. The GT Sovteks are probably your best bet if you use lots of pedals anyway. For a good video showing how to bias your amp, check the site below. After reading, scroll down and click on the first link, "#1. Fender Hot Rod Deville / Deluxe Bias". Keep in mind when reading, they sell JJ tubes exclusively, so not much good is said about all other tubes, and a little BS to boot. :wink: But, good videos none-the-less. In this amp, if you want to drop the output somewhat, you can use GT 6V6 S, or JJ 6V6, (instead of 6L6) but only these two brands of 6V6 will work in this case. Of course, pay attention to the bias difference with the 6V6 vs the 6L6.

http://www.eurotubes.com/eurotubes-how-to-bias-video-probe-Pro-One.htm

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Post subject: Re: HRD410 help
Posted: Thu Mar 14, 2013 9:51 pm
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The stock tubes are alright but they're all I've ever tried so I'm sort of wondering if there's better because generally stock anything isn't amazing. Yeah they're sovtek but the the label is all black, assuming due to it blowing out. I read that you can't use 6V6's because it bottles your tone or something like that I'm not sure. I don't dislike the tubes because as I said it sounds pretty good clean but yeah was just wondering is all.


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Post subject: Re: HRD410 help
Posted: Thu Mar 14, 2013 10:13 pm
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The two types of 6V6 that I listed can be used, they are special in that they can handle the higher Plate voltage of this amp, up to 500 volts. These two 6V6 types sound more like a 6L6 and won't hurt your tone, but since they are lower wattage than a 6L6 your power will drop by about half.

You might have to try a few different tubes to find what you feel are "best".

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Post subject: Re: HRD410 help
Posted: Thu Mar 14, 2013 11:39 pm
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Oh really? That's awesome because I can never turn it louder than 3 so being able to double that to get some nicer breakup would be good.

So either of these would be fine? Which would you choose.
Thanks

http://www.ebay.com.au/itm/New-matched- ... _887wt_648

http://www.ebay.com.au/itm/6V6GT-6P6S-R ... _871wt_882


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Post subject: Re: HRD410 help
Posted: Thu Mar 14, 2013 11:52 pm
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shimmilou wrote:
These two 6V6 types sound more like a 6L6 and won't hurt your tone, but since they are lower wattage than a 6L6 your power will drop by about half.


However if the amp currently develops 125dB at the onset of compression, OD, and breakup, that SPL will only be reduced by about 3dB. And 122dB is still loud enough to empty the first five rows in a hall or club because the patrons all developed chronic nosebleeds. The correlation between power output and how the human ear processes loudness is logarithmic, not linear.

Arjay

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Post subject: Re: HRD410 help
Posted: Fri Mar 15, 2013 12:34 am
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$@!&.. this is getting confusing haha
my priority is just getting some new tubes, I was going to invest in an attenuator in the near future but I was just asking because I thought I might be able to kill two birds with one stone, it's not critical though so if it's too much hassle I'll just grab some regular power tubes.. just gotta know which ones would suit running loads of pedals for so I need clean but still with a bit of breakup.


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Post subject: Re: HRD410 help
Posted: Fri Mar 15, 2013 10:35 am
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A power soak or attenuator will accomplish your goal and permit the use of standard 6L6 tubes (they'll still require biasing whenever you change them out though).

Arjay

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Post subject: Re: HRD410 help
Posted: Fri Mar 15, 2013 9:14 pm
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I think I'll go for standard tubes to play it safe then.
As for biasing, never done it before is it hard?
And what standard tubes should I be looking at?


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Post subject: Re: HRD410 help
Posted: Fri Mar 15, 2013 10:52 pm
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Also just checked both my poewr tubes, the label on one is completely blange and singed and the other is slightly yellow so assuming the black one's dead and the other was on its way.
I don't really want to bias it myself after reading about how unsafe it is and how it can hold a lethal amount of voltage, so if I get the exact same ones will I not have to bias?
They're both 'sovtek 5881wxt' one says 1001 on the back the other 09 05, on the label I can read it's a gt-6l6-r so assuming the other is the same? But yeah if I find the same ones do I still have to bias? It's just I'm really broke at the moment and wouldn't be able to afford to get a tech to bias it and have gigs coming up.


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Post subject: Re: HRD410 help
Posted: Fri Mar 15, 2013 11:05 pm
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If you have gigs pending but you're loath to dive into the amp to replace the output bottles and bias it yourself, I suggest that you get "un-broke" ASAP. No guitar hero has ever stood on stage in front of a paying audience with a broken amp behind him and had any possible excuse that wouldn't be categorized as LAME.

:roll:

Arjay

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Post subject: Re: HRD410 help
Posted: Fri Mar 15, 2013 11:10 pm
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That was a pretty crap reply, "get un-broke", doesn't work like that.
I'm willing to bias it myself but I'm just wondering how dangerous it is, as I said earlier I've built pedals before so I have some idea of how it works but not sure if it's worth risking my life.


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Post subject: Re: HRD410 help
Posted: Fri Mar 15, 2013 11:17 pm
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You asked, pal.

You can be a hero or a zero.

The choice is all yours.

Arjay

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Post subject: Re: HRD410 help
Posted: Fri Mar 15, 2013 11:42 pm
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Do you have a book of cliche's next to you or something?
I think I'm just going to get the same tubes and then maybe try and fix the bias.
Is there a way of sort of safe guarding yourself? Draining the current somehow or wearing/doing something or only fixing it on a certain surface so I'm free from.. uh.. death.


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Post subject: Re: HRD410 help
Posted: Sat Mar 16, 2013 5:49 am
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Check the link to the video that I posted in my first reply. One reason that I asked about the labels is so that you could get the exact same replacement tubes. But if you can't read the rating number and color details on the GT label, you might not get the same ones if you just ordered randomly. The GT number/color rating allows exact replacement without having to re-bias........that is, if it was biased correctly to begin with.........and we don't know if the bias was correct when you got the amp anyway, so......

While you are trying to figure this stuff out, search the forum for "bias" threads and read up on the plethora of info available here.

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