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Modular Amps
DIY
Randall Modern to Orange Rockerverb - Sorted
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<blockquote data-quote="Mattallica" data-source="post: 157646" data-attributes="member: 3748"><p>I'm now revisiting this since learning about the initial gain stage before the module. </p><p></p><p>My error was not accounting for this when modding the module. No wonder the circuit was overloading.</p><p></p><p>So as a quick fix to see if this was the problem, i simply bypassed the first stage on the module with a jumper wire.</p><p></p><p>It worked, so now i have a nominal level of volume and all the knobs seem to do something. It sounds ok, but not great.</p><p></p><p>So more work needs to be done. I'm still in the process of understanding how this all works. </p><p></p><p>I'm going to add the first stage back in but with a lower value grid leak resistor to attenuate the signal. I don't know how much this will make the module deviate from the Orange sound, but there isn't much choice.</p><p></p><p>Bypassing the amp V1 would be the easiest option but that's not a practical approach in the wider picture. I think there is another resistor before the opto coupler i'm not accounting for as well...</p><p></p><p>Noob ramble over.</p></blockquote><p></p>
[QUOTE="Mattallica, post: 157646, member: 3748"] I'm now revisiting this since learning about the initial gain stage before the module. My error was not accounting for this when modding the module. No wonder the circuit was overloading. So as a quick fix to see if this was the problem, i simply bypassed the first stage on the module with a jumper wire. It worked, so now i have a nominal level of volume and all the knobs seem to do something. It sounds ok, but not great. So more work needs to be done. I'm still in the process of understanding how this all works. I'm going to add the first stage back in but with a lower value grid leak resistor to attenuate the signal. I don't know how much this will make the module deviate from the Orange sound, but there isn't much choice. Bypassing the amp V1 would be the easiest option but that's not a practical approach in the wider picture. I think there is another resistor before the opto coupler i'm not accounting for as well... Noob ramble over. [/QUOTE]
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Modular Amps
DIY
Randall Modern to Orange Rockerverb - Sorted
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