James Perrett wrote:Arpangel wrote:Hugh Robjohns wrote:Yes, and 303s. Amazing how often those old hi-fi Quad amps turned up in lo-fi studio applications!
Yes, I wish mine didn’t have the volume knobs though. I suppose it would be a simple job to bypass them, but he's drilled holes, shame.
Before you go taking the pots out remember that the standard 405 is much too sensitive for a typical mixer output so you may well need some kind of internal attenuator anyway. My 405 is fed via a home made attenuator adaptor.
Of course, if you really want to get into things you could change the circuit around the input op-amp to reduce the sensitivity but be aware that the 405 circuit is fairly cleverly designed and relies on various parts of the circuit having the right time constants for stability so any mods need to take this into account.
Thanks James, I’m running a 33 preamp with it right now, and everything is fed into that, all that’s going into the 405 is the output of the 33 via the appropriate lead.
I’m also running an Art Clean Box into the 33 from my interface, balanced to unbalanced, it all sounds fine. It’s just that the volume pots needn’t be there, so I may as well just get rid of them