Members Dr_spooju Posted February 10, 2004 Members Share Posted February 10, 2004 i have a peavey 50/50 and it has four positions for preamp tubes, two for 12ax7s and two for 12at7s. what would be the outcome for putting the 12ax7s in the 12at7s positions and does anyone have any suggestions? Link to comment Share on other sites More sharing options...
Members tubefreak Posted February 10, 2004 Members Share Posted February 10, 2004 In short 12at7 have more headroom and less gain. You can swap them around without any trouble or harming the amp. I've used 12a7 and 12at7's many times to finetune (pre)amps, with great results. Just try it out and see what you like.Maarten Link to comment Share on other sites More sharing options...
Members sp_spaceboy Posted February 10, 2004 Members Share Posted February 10, 2004 well, I don't really know, but although you can put 12at7s in place of ax7s, cos they're lower gain, is there no chance that doing it the other way around might draw too much current and damage something? i dunno, just a thought Link to comment Share on other sites More sharing options...
Members RedMikeLine Posted February 10, 2004 Members Share Posted February 10, 2004 Originally posted by Dr_spooju i have a peavey 50/50 and it has four positions for preamp tubes, two for 12ax7s and two for 12at7s. what would be the outcome for putting the 12ax7s in the 12at7s positions and does anyone have any suggestions? Well, I'm asuming that your talking about the 50/50 power amp (I don't know much about peavey), than the 12at7 is originally in the phase inverter position and the 12ax7 is originally in the pre driver position. So there's one pre and PI for each side of the power amp. But as for what you can expect when you switch them? I don't know. I highly doubt it will sound better. Link to comment Share on other sites More sharing options...
Members Dr_spooju Posted February 11, 2004 Author Members Share Posted February 11, 2004 sorry i didn't mean switching the ax7s and at7s around but having four ax7s all together. Link to comment Share on other sites More sharing options...
Members tubefreak Posted February 11, 2004 Members Share Posted February 11, 2004 The current draw is somewhat different, indeed, but shouldn't cause any trouble in your amp. When you use small tube stompboxes, then the powersupplies may be insufficient, but I don't expect this in a tube poweramp. NEVER heard of anyone having trouble with it. Maarten Link to comment Share on other sites More sharing options...
Members Rai168 Posted February 11, 2004 Members Share Posted February 11, 2004 You should have no trouble at all. It's the same as an amp head - you can sub a 12ax7,12at7,12ay7 whatever your preference/gain needs is/are. I actually did this w my VHT UL w EQ (VooDoo Amps Modded) and dropped a 12ax7 in the PI which actually gave me more power amp distortion and warmth in my signal path. Keep in mind I run KT88's (VHT UL) which don't break up hence why the 12ax7 crunch provides extra warmth. Hope it helps - Rai // www.DatsMusic.com Link to comment Share on other sites More sharing options...
Recommended Posts
Archived
This topic is now archived and is closed to further replies.