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Modular Amps
Egnater / Randall Modular Amps
RM20 power amp mods
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<blockquote data-quote="stalksdalls" data-source="post: 154562" data-attributes="member: 3720"><p>Hi! I'm intrigued about the possibility of adding a Master Volume pot to my RM20, but I find your instructions confusing. The written instructions seem to conflict with the photos.</p><p><em></em></p><p><em>"- lift the right side (looking from the front) of C9 from the board; </em></p><p><em>- solder to pin 1 of an A1M pot (1M log / audio taper) pot; "</em></p><p></p><p>If I understand that correctly, C9 is the larger of the two capacitors (the one on the left), labeled 0.1uF. I can see that the right side has been moved up to the <u>top</u> pin of the volume pot.</p><p></p><p><em>"- solder an 0.1uF cap from pin 2 of the pot back to the vacant hole from C9;"</em> </p><p></p><p>In the photo, it appears that the capacitor that is soldered from pin 2 of the pot back to the vacant hole (on the right) of C9 is <strong>1nF</strong>, <u>not</u> 0.1uF.</p><p></p><p>The rest of the written instructions seem to make sense, but the caption under the photo says that the 0.1uF cap goes to pin 3 of the pot instead of pin 1. In the photo it is soldered to the <u>top</u> pin. Is that pin 1 or pin 3?</p><p></p><p>Thanks,</p><p>Jim</p></blockquote><p></p>
[QUOTE="stalksdalls, post: 154562, member: 3720"] Hi! I'm intrigued about the possibility of adding a Master Volume pot to my RM20, but I find your instructions confusing. The written instructions seem to conflict with the photos. [i] "- lift the right side (looking from the front) of C9 from the board; - solder to pin 1 of an A1M pot (1M log / audio taper) pot; "[/i] If I understand that correctly, C9 is the larger of the two capacitors (the one on the left), labeled 0.1uF. I can see that the right side has been moved up to the [u]top[/u] pin of the volume pot. [i]"- solder an 0.1uF cap from pin 2 of the pot back to the vacant hole from C9;"[/i] In the photo, it appears that the capacitor that is soldered from pin 2 of the pot back to the vacant hole (on the right) of C9 is [b]1nF[/b], [u]not[/u] 0.1uF. The rest of the written instructions seem to make sense, but the caption under the photo says that the 0.1uF cap goes to pin 3 of the pot instead of pin 1. In the photo it is soldered to the [u]top[/u] pin. Is that pin 1 or pin 3? Thanks, Jim [/QUOTE]
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Modular Amps
Egnater / Randall Modular Amps
RM20 power amp mods
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