Members Jesse G Posted April 2, 2010 Members Share Posted April 2, 2010 I read on a forum that you can take the first and last power tubes out and make it easier to get a cranked sound at a lower volume. But they could have been being sarcastic. I was recording last night and had it on 3 and I got a visit from the police. Also, while we're on the subject, how does changing the bias affect the sound? Mine is bias modded and I'd like to play with it. Link to comment Share on other sites More sharing options...
Members NinjaRaf Posted April 2, 2010 Members Share Posted April 2, 2010 A lot of amps you can, but idk if you can with the 6505 series...I would get on FJAs site and send him an email. Link to comment Share on other sites More sharing options...
Members "sasquatch" Posted April 2, 2010 Members Share Posted April 2, 2010 since all the overdrive comes from the pre amp section, you could also adjust your post volume. much easier fix. Link to comment Share on other sites More sharing options...
Members guitarded_1 Posted April 2, 2010 Members Share Posted April 2, 2010 No - you will not get a perceptible change in volume. You will go from "{censored}ing loud" with 4 tubes to "{censored}ing loud" with 2 tubes. You may be able to push the power section into overdrive a bit quicker, but that's not really necessary on an amp like that, so much as it is on a NMV amp. Pulling 2 tubes won't really accomplish much. If you do it, be sure and halve the impedance. Link to comment Share on other sites More sharing options...
Members Rampage Posted April 2, 2010 Members Share Posted April 2, 2010 It isn't going to make a discernible difference. I think it is a 3 db change (correct me if I am wrong tube guys)? I'd just let it go. Link to comment Share on other sites More sharing options...
Members Jesse G Posted April 2, 2010 Author Members Share Posted April 2, 2010 Damn, so I have to upset the neighbors to get teh epic toans. Link to comment Share on other sites More sharing options...
Members NinjaRaf Posted April 2, 2010 Members Share Posted April 2, 2010 Yeah, I also shoulda mentioned that its still gonna kill small animals... Link to comment Share on other sites More sharing options...
Members Jesse G Posted April 2, 2010 Author Members Share Posted April 2, 2010 It isn't going to make a discernible difference. I think it is a 3 db change (correct me if I am wrong tube guys)?I'd just let it go. But isn't a 3db reduction like halving the volume? Link to comment Share on other sites More sharing options...
Members Sixtonoize Posted April 2, 2010 Members Share Posted April 2, 2010 But isn't a 3db reduction like halving the volume? No...a 10db reduction (or 1/10th the output power, or 12 watts) is equal to half of the perceived volume. Link to comment Share on other sites More sharing options...
Members "sasquatch" Posted April 2, 2010 Members Share Posted April 2, 2010 But isn't a 3db reduction like halving the volume? no. 9db. the 6505 is 120 watts, right? you are going to have to get down around 12 watts to cut it in half. dude, the overdrive is in the pre-amp section. just turn the pre up and keep the post down. its that simple. Link to comment Share on other sites More sharing options...
Members StringKing7 Posted April 2, 2010 Members Share Posted April 2, 2010 You need 10 times less wattage to get half the volume. I think... Link to comment Share on other sites More sharing options...
Members "sasquatch" Posted April 2, 2010 Members Share Posted April 2, 2010 No...a 10db reduction (or 1/10th the output power, or 12 watts) is equal to half of the perceived volume. beat me to it.... Link to comment Share on other sites More sharing options...
Members "sasquatch" Posted April 2, 2010 Members Share Posted April 2, 2010 You need 10 times less wattage to get half the volume. I think... roughly correct. every doubling of wattage = 3 more db. Link to comment Share on other sites More sharing options...
Members Jesse G Posted April 2, 2010 Author Members Share Posted April 2, 2010 no. 9db. the 6505 is 120 watts, right? you are going to have to get down around 12 watts to cut it in half. dude, the overdrive is in the pre-amp section. just turn the pre up and keep the post down. its that simple. Yeah, but it sounds grainy until it's turned up to 3 or so which is roaring loud. Link to comment Share on other sites More sharing options...
Members "sasquatch" Posted April 2, 2010 Members Share Posted April 2, 2010 Yeah, but it sounds grainy until it's turned up to 3 or so which is roaring loud. well, you could try an EQ in the loop to lower the volume, but not sure if it will work too well. it would be interesting to find out though. Link to comment Share on other sites More sharing options...
Members Jesse G Posted April 2, 2010 Author Members Share Posted April 2, 2010 So learn me about adjusting the bias. Whats the difference in tone between colder and hotter settings? It's bias modded. Link to comment Share on other sites More sharing options...
Members Sixtonoize Posted April 2, 2010 Members Share Posted April 2, 2010 Colder bias = more aggressive (modern)Hotter bias = rounder/less aggressive (vintage) It's a pretty small change, but I liked the result after I bias modded my 5150. Link to comment Share on other sites More sharing options...
Members guitarded_1 Posted April 2, 2010 Members Share Posted April 2, 2010 So learn me about adjusting the bias.Whats the difference in tone between colder and hotter settings? It's bias modded. Just don't fly blind on it. know what the appropriate range is and then play around within that range. Link to comment Share on other sites More sharing options...
Members Mavesicles Posted April 2, 2010 Members Share Posted April 2, 2010 Yeah, but it sounds grainy until it's turned up to 3 or so which is roaring loud. Yeah dude, that's the nature of the beast. It needs to be turned up. That's why I bought a Vypyr for practice. Link to comment Share on other sites More sharing options...
Members twistofcain Posted April 2, 2010 Members Share Posted April 2, 2010 The 6505+ is adjustable bias, but it's bias range is too small to hurt anything if you crank it. Turn the dial all the way up, it will get a little bit warmer, but you still need a bias mod to get the bias to the "proper" spot. Link to comment Share on other sites More sharing options...
Members twistofcain Posted April 2, 2010 Members Share Posted April 2, 2010 One thing I did with mine, was crank it, and cover 3 of the speakers with pillows... It made it a little quieter and helped me crank the amp up a little more. You only need one speaker to record with anyways. Link to comment Share on other sites More sharing options...
Members StringKing7 Posted April 2, 2010 Members Share Posted April 2, 2010 One thing I did with mine, was crank it, and cover 3 of the speakers with pillows... It made it a little quieter and helped me crank the amp up a little more. You only need one speaker to record with anyways. Link to comment Share on other sites More sharing options...
Members Mavesicles Posted April 2, 2010 Members Share Posted April 2, 2010 The 6505+ is adjustable bias, but it's bias range is too small to hurt anything if you crank it. Turn the dial all the way up, it will get a little bit warmer, but you still need a bias mod to get the bias to the "proper" spot. I think you actually turn the dial counter clockwise. Link to comment Share on other sites More sharing options...
Members twistofcain Posted April 2, 2010 Members Share Posted April 2, 2010 I think you actually turn the dial counter clockwise. So that explains it... I just turned mine all the way to the other side. Don't know if it was counter clockwise, or clockwise. Link to comment Share on other sites More sharing options...
Members Mavesicles Posted April 2, 2010 Members Share Posted April 2, 2010 So that explains it... I remember guitarbilly saying to turn it counter clockwise to make it hotter. Link to comment Share on other sites More sharing options...
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