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Modular Amps
Jaded Faith Mods
Tube recommendations for RM4
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<blockquote data-quote="trimix" data-source="post: 127348" data-attributes="member: 2238"><p>Looking at the back of the RM4, the single lower tube is V1. The upper right tube is the output driver and the upper left tube is the loop buffer/mixer.</p><p></p><p>I spent the weekend rolling tubes in my RM4 and modules. I previously used an RM50H and figured they were different enough to revisit everything. V1 ended up being exactly what JF posted, a Ruby 12AX7AC5 HG, which is what it came with. I tried RCA, Mullard, Amperex, Telefunken, Tung-Sol RI, EH, JJ, Sovtek... nope, the Grail just didn't get there without that Shuguang in V1.</p><p></p><p>For fun, here's what ended up working in my stockish mods:</p><p></p><p>Clean - V1 RCA 12AX7, V2 Tung-Sol RI 12AX7</p><p>SL+ - V1 Ruby 12AX7AC5 HG, V2 Amperex (Hammond) 12AX7</p><p>Grail - V1 JJ ECC83S, V2 Amperex (Hammond) 12AX7</p></blockquote><p></p>
[QUOTE="trimix, post: 127348, member: 2238"] Looking at the back of the RM4, the single lower tube is V1. The upper right tube is the output driver and the upper left tube is the loop buffer/mixer. I spent the weekend rolling tubes in my RM4 and modules. I previously used an RM50H and figured they were different enough to revisit everything. V1 ended up being exactly what JF posted, a Ruby 12AX7AC5 HG, which is what it came with. I tried RCA, Mullard, Amperex, Telefunken, Tung-Sol RI, EH, JJ, Sovtek... nope, the Grail just didn't get there without that Shuguang in V1. For fun, here's what ended up working in my stockish mods: Clean - V1 RCA 12AX7, V2 Tung-Sol RI 12AX7 SL+ - V1 Ruby 12AX7AC5 HG, V2 Amperex (Hammond) 12AX7 Grail - V1 JJ ECC83S, V2 Amperex (Hammond) 12AX7 [/QUOTE]
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Modular Amps
Jaded Faith Mods
Tube recommendations for RM4
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