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PostPosted: Mon Dec 10, 2018 11:04 am 
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Bottle Rocket

Joined: Fri Dec 07, 2018 12:40 am
Posts: 2
Hi,
I am new to this board. I just bought my third Dual Rectifier and I am amazed by the tonal differences I hear between different Dual Rectifiers. After close inspection, I realized that this one had a very peculiar set of pre-amp tubes in it. So I was wondering what other people do? It seems the Pre-amp tubes give you a lot of control over the tone. Any tips for pre-amp tube sets? I am mostly looking for the early 90th sound. The amps are all early 90th.

More specific:
- what is the difference in tone between an STR 420 and an STR 440.
- it appears that the V5 ECC83 needs to be balanced. Anything special about that? There are sets that just have the same ECC83S balanced pre-amp tubes in every slot. Mine seems to have an interesting mix of RFT, JJ ECC83s and some Chinese tubes.


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PostPosted: Mon Dec 10, 2018 9:13 pm 
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Mark II

Joined: Tue Nov 18, 2014 11:09 pm
Posts: 76
I loved the old STR-420s and wish I could find something that sounds as good as they did. So far my favorite V1 tube is an EH 12AX7, though most people prefer the Tung Sol


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PostPosted: Tue Dec 11, 2018 2:09 pm 
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Bottle Rocket

Joined: Fri Dec 07, 2018 12:40 am
Posts: 2
I bought a few extra now for future usage :-) It seems there is agreement that they sounded better than the STR 440.

V1 tube: I have an RFT in there. Do you know what the difference in sound between EH 12AX7 and Tung Sol or the RFT is? Instead of trying a lot of different 12AX7 I am hoping to get some feedback what already worked out for people.


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PostPosted: Thu Dec 20, 2018 11:11 pm 
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Mark II

Joined: Tue Nov 18, 2014 11:09 pm
Posts: 76
Sorry, I was on vacation.

The EH sounds thicker and has more low end. The Tung Sol has more top end and is smoother. I play a lot of 90s rock and no metal, so the EH fits my needs a lot better.


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PostPosted: Sat Dec 29, 2018 6:04 pm 
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Mark IV

Joined: Thu Aug 15, 2013 12:20 am
Posts: 662
Location: Tucson, AZ
The EHX 12AX7 has a spiral filament in it which is prone to failure when used in positions with high voltage on the cathode. Those are V3 and V4 on any Rectifier schematic I've ever seen.

I also like the EHX and Tung Sol tubes. I'm also really digging the high gain JJ ECC83s (which is also rebranded as Ruby 12AX7ACZ). They are low noise with gains over 100. Mine are all measured from 110 to 120. The theoretical gain of a 12AX7 is 100, so using them ensures you get maximum signal. I have a Tung Sol in V1 and the JJs in all the rest.

_________________
2007 3 Channel Dual Recto w/loop mod

My Humble Music Tech Blog:
Dual Rectifier Index


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PostPosted: Tue Jan 01, 2019 8:59 am 
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Mark III

Joined: Sun Mar 06, 2016 10:38 am
Posts: 244
Location: Western Colorado
I like Chinese or JJs pres in my Rectos.

Here's a 6L6 comparo I did that included 420s & 440s. I preferred the 420s in my Recto, but when they run out the 440 will be just fine.
https://youtu.be/j6JtsvSnRgI


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