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Post subject: Re: Deluxe Reverb Reissue blowing fuses
Posted: Mon Nov 16, 2015 3:25 am
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At least , I hope you follow advice about bias.........


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Post subject: Re: Deluxe Reverb Reissue blowing fuses
Posted: Mon Nov 16, 2015 7:20 am
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The bias was done on the amp.


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Post subject: Re: Deluxe Reverb Reissue blowing fuses
Posted: Mon Nov 16, 2015 8:53 am
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stratele52 wrote:
You may do not need new rectifier tube ,it last very long time .


Stratele, this is a DRRI. They come with either Russian or Chinese made 5AR4 rectifiers. 1980-90s made R & C ones have a not-so-good reputation. Modern 2010s made Chinese ones (esp selected ones --- like TAD) have improved. But, still not the reliability of a good vintage Mullard GZ34 or US made 5AR4.


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Post subject: Re: Deluxe Reverb Reissue blowing fuses
Posted: Mon Nov 16, 2015 9:12 am
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BMW2002Ti wrote:
stratele52 wrote:
You may do not need new rectifier tube ,it last very long time .


Stratele, this is a DRRI. They come with either Russian or Chinese made 5AR4 rectifiers. 1980-90s made R & C ones have a not-so-good reputation. Modern 2010s made Chinese ones (esp selected ones --- like TAD) have improved. But, still not the reliability of a good vintage Mullard GZ34 or US made 5AR4.



All these DDRI and modern amps will not have reliability of Blackface too .

There is no reason to go on only on vintage stuff, same for tubes

My experience with modern rectifier tubes show me, they last long time no need to buy USA made rectifier or Mulard .


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Post subject: Re: Deluxe Reverb Reissue blowing fuses
Posted: Mon Nov 16, 2015 6:47 pm
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stratele52 wrote:
BMW2002Ti wrote:
stratele52 wrote:
You may do not need new rectifier tube ,it last very long time .


Stratele, this is a DRRI. They come with either Russian or Chinese made 5AR4 rectifiers. 1980-90s made R & C ones have a not-so-good reputation. Modern 2010s made Chinese ones (esp selected ones --- like TAD) have improved. But, still not the reliability of a good vintage Mullard GZ34 or US made 5AR4.



All these DDRI and modern amps will not have reliability of Blackface too .

There is no reason to go on only on vintage stuff, same for tubes

My experience with modern rectifier tubes show me, they last long time no need to buy USA made rectifier or Mulard .


Hello stratele,

My experience differs, I had two current production Sovteks and a JJ gz34 all go out within 2 months of being replaced on my Amps. Switched back to NOS and I haven't had an issue since. I haven't tried the Chinese rectifiers (I've heard they're more robust) but I'm fully stocked with NOS and don't plan on trying them any time soon. :D

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Post subject: Re: Deluxe Reverb Reissue blowing fuses
Posted: Mon Nov 16, 2015 7:21 pm
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My JJ 5AR4 has been going strong for 4 years now. Actually all of the JJ tubes I put in back then (full set) haven't given me any problems yet. IIRC I got them from Tube Depot. Admittedly the amp gets light use and I check the bias periodically.


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Post subject: Re: Deluxe Reverb Reissue blowing fuses
Posted: Tue Nov 17, 2015 2:08 am
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socal323

If new these tubes are so worst , why can we find them in all modern tubes amps wich use tubes rectifier ?

And we don't know if Kenney V ' tube was defective.


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Post subject: Re: Deluxe Reverb Reissue blowing fuses
Posted: Tue Nov 17, 2015 3:04 am
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stratele52 wrote:
If new these tubes are so worst , why can we find them in all modern tubes amps wich use tubes rectifier ?


The "why" is elementary......because those new tubes are inexpensive.

And all the good NOS stuff is being hoarded by the likes of tube junkies like me.

:lol:

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Post subject: Re: Deluxe Reverb Reissue blowing fuses
Posted: Tue Nov 17, 2015 3:19 am
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Retroverbial wrote:
stratele52 wrote:
If new these tubes are so worst , why can we find them in all modern tubes amps wich use tubes rectifier ?


The "why" is elementary......because those new tubes are inexpensive.

And all the good NOS stuff is being hoarded by the likes of tube junkies like me.



:lol:

Arjay


First of all , they work .
Inexpensive if no good, amp builder won't use them .

Where do we read anywhere ; don't use new rectifier tubes they are crap ?


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Post subject: Re: Deluxe Reverb Reissue blowing fuses
Posted: Tue Nov 17, 2015 6:50 am
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stratele52 wrote:
Where do we read anywhere ; don't use new rectifier tubes they are crap ?


You read it right here, mon amí.

They're merde......like everything else made today.

And if that weren't the truth, we wouldn't even be having this discussion.

Arjay

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Post subject: Re: Deluxe Reverb Reissue blowing fuses
Posted: Tue Nov 17, 2015 7:37 am
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I really don't know why it is taking manufacturers so long to make a consistently good modern tube rectifier. Diodes (tube type) are one of the most basic & oldest types ever made. Been around since AC power became the norm.

Prolly due to the current required (usually in the several hundred of mA). The QA and construction needs to be good to get long, safe service. In addition, many amp designers don't help by not sticking strictly to the rectifier's guidelines, laid out by the tube's manufacturer. Over filtering --- which a good Mullard GZ34 can handle --- often is too much demand on today's rectifiers. Many are simply re-manufactured designs of older Soviet or Chinese military types. Not true GZ34, 5Y3GT, or 5U4GB. These modern tubes aren't as tolerant to combo amps or ones that are being manhandled from gig to gig. Or excessive current & voltage demands of many amps.

Anyhow, for heavy mA demanding GZ34 amps, I have been using NOS US made 5U4GB, if possible. As long as the PT can handle the extra current demands of the 5U4GB versus the GZ34. With a good US made 5U4GB you never hear of arc-over or shorts. Even in amps that are constantly being gigged and moved. Or in combo amps. And a good 5U4GB is not outrageously $$$, as an NOS GZ34 or US made 5AR4. Yes, there is more sag with the 5U4GB, but they last forever.

I recommend putting solid-state diodes inline with the plates of any combo amp running modern GZ34. You will still have slow startup. The tube sag inherent to the GZ34. Plus a DC rectifier backup, in case the tube rectifier shorts out.

With that in mind... if you want to use today's GZ34/5AR4 --- buy a selected one. Like Chinese made TAD. Russian made Gold Lion/Genalex or Tungsol reissue. Seriously, consider the addition of solid-state inline diodes. This being the recommendations of Jim McShane. A very good supplier of tubes.


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Post subject: Re: Deluxe Reverb Reissue blowing fuses
Posted: Tue Nov 17, 2015 12:20 pm
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Retroverbial wrote:
stratele52 wrote:
Where do we read anywhere ; don't use new rectifier tubes they are crap ?


You read it right here, mon amí.

They're merde......like everything else made today.

And if that weren't the truth, we wouldn't even be having this discussion.

Arjay


No I did not read that anywhere .


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Post subject: Re: Deluxe Reverb Reissue blowing fuses
Posted: Tue Nov 17, 2015 5:35 pm
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stratele52 wrote:
socal323

If new these tubes are so worst , why can we find them in all modern tubes amps wich use tubes rectifier ?

And we don't know if Kenney V ' tube was defective.


Never said they were worse or bad, I merely stated my experience with said tubes. The lesson that I took from my limited exposure to the current new production rectifier tubes was that I'm better off going NOS.....at least with rectifiers. :wink:

Oh, and by the way, I'm just thinking out loud here but I'm willing to bet that a majority of warranty repairs on all these reissues is prolly rectifiers and power tubes......but I may be wrong. :D

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Post subject: Re: Deluxe Reverb Reissue blowing fuses
Posted: Tue Nov 17, 2015 6:22 pm
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socal323 wrote:
Oh, and by the way, I'm just thinking out loud here but I'm willing to bet that a majority of warranty repairs on all these reissues is prolly rectifiers and power tubes......but I may be wrong. :D


I think if FMIC were to ever make their warranty-claim stats public, we'd find that the majority of the amp issues were directly attributable to that miserable RoHS-compliant solder. I'd score defective tubes as a close second.

Arjay

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Post subject: Re: Deluxe Reverb Reissue blowing fuses
Posted: Tue Nov 17, 2015 8:05 pm
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Retroverbial wrote:
socal323 wrote:
Oh, and by the way, I'm just thinking out loud here but I'm willing to bet that a majority of warranty repairs on all these reissues is prolly rectifiers and power tubes......but I may be wrong. :D


I think if FMIC were to ever make their warranty-claim stats public, we'd find that the majority of the amp issues were directly attributable to that miserable RoHS-compliant solder. I'd score defective tubes as a close second.

Arjay

What do they used to replace the lead in that stuff?


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