Well, all i can tell you is that with the 450R per side the high gain tones are literally jaw dropping. Once i got it "right" the tone is good, but certainly not even close in high gain mode. the cleans are better like this, but the high gain tones i'd say are 1/2 as good. maybe about the same as a JCM800. I'm going to have to make it switchable.
As to the joke about cooking, why would that even happen with LESS power? If it's going to get hot it should get hotter with more watts, no? I'm also still very confused, tho explaining why will likely confuse you more ! but here goes...
The amp redplated with two 270R's, one for each tube. I just realized, or at least it seems that by using one per tube the value is essentially halved so it would be like using a single 135R going to both cathodes tied together. Am i right so far?
If i am, then here are two things i don't understand. 1)-the 2 amps i mentioned are using two 270R's, which means 135R total. Isn't this stupid low for any EL34 amp with similar iron and other circuit values to mine? And 2)- and this one really confuses me....the amp sounded very different with one 270 than with 2 450's. But from what i mentioned above about the value being halved when 2 R's are used, i should have been doing the same thing with a 450 per each tube as with one 270 shared, no? this makes me think the only explanation is that using a seperate R per tube is a much richer sound, because the values were the same. But even if that were true it still doesn't explain the extra power the amp displayed both to my ears and via the calculator.
No doubt it's partially lack of communication between us because trying to discuss something like this in a forum is worlds tougher than in person. i appreciate you guys trying to help, but every reply generates more questions and by the time i get around to asking them you guys are already ahead of me and talking about other things. So yeah....i am cornfused !!!
help calculating bias resistor
Moderators: pompeiisneaks, Colossal
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iknowjohnny
- Posts: 1070
- Joined: Thu Apr 24, 2008 2:10 am
- Location: los angeles
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iknowjohnny
- Posts: 1070
- Joined: Thu Apr 24, 2008 2:10 am
- Location: los angeles
Re: help calculating bias resistor
Well, all i can tell you is that with the 450R per side the high gain tones are literally jaw dropping. Once i got it "right" the tone is good, but certainly not even close in high gain mode. the cleans are better like this, but the high gain tones i'd say are 1/2 as good. maybe about the same as a JCM800. I'm going to have to make it switchable.
As to the joke about cooking, why would that even happen with LESS power? If it's going to get hot it should get hotter with more watts, no? I'm also still very confused, tho explaining why will likely confuse you more ! but here goes...
The amp redplated with two 270R's, one for each tube. I just realized, or at least it seems that by using one per tube the value is essentially halved so it would be like using a single 135R going to both cathodes tied together. Am i right so far?
If i am, then here are two things i don't understand. 1)-the 2 amps i mentioned are using two 270R's, which means 135R total. Isn't this stupid low for any EL34 amp with similar iron and other circuit values to mine? And 2)- and this one really confuses me....the amp sounded very different with one 270 than with 2 450's. But from what i mentioned above about the value being halved when 2 R's are used, i should have been doing the same thing with a 450 per each tube as with one 270 shared, no? this makes me think the only explanation is that using a seperate R per tube is a much richer sound, because the values were the same. But even if that were true it still doesn't explain the extra power the amp displayed both to my ears and via the calculator.
No doubt it's partially lack of communication between us because trying to discuss something like this in a forum is worlds tougher than in person. i appreciate you guys trying to help, but every reply generates more questions and by the time i get around to asking them you guys are already ahead of me and talking about other things. So yeah....i am cornfused !!!
As to the joke about cooking, why would that even happen with LESS power? If it's going to get hot it should get hotter with more watts, no? I'm also still very confused, tho explaining why will likely confuse you more ! but here goes...
The amp redplated with two 270R's, one for each tube. I just realized, or at least it seems that by using one per tube the value is essentially halved so it would be like using a single 135R going to both cathodes tied together. Am i right so far?
If i am, then here are two things i don't understand. 1)-the 2 amps i mentioned are using two 270R's, which means 135R total. Isn't this stupid low for any EL34 amp with similar iron and other circuit values to mine? And 2)- and this one really confuses me....the amp sounded very different with one 270 than with 2 450's. But from what i mentioned above about the value being halved when 2 R's are used, i should have been doing the same thing with a 450 per each tube as with one 270 shared, no? this makes me think the only explanation is that using a seperate R per tube is a much richer sound, because the values were the same. But even if that were true it still doesn't explain the extra power the amp displayed both to my ears and via the calculator.
No doubt it's partially lack of communication between us because trying to discuss something like this in a forum is worlds tougher than in person. i appreciate you guys trying to help, but every reply generates more questions and by the time i get around to asking them you guys are already ahead of me and talking about other things. So yeah....i am cornfused !!!
-
iknowjohnny
- Posts: 1070
- Joined: Thu Apr 24, 2008 2:10 am
- Location: los angeles
Re: help calculating bias resistor
Well, all i can tell you is that with the 450R per side the high gain tones are literally jaw dropping. Once i got it "right" the tone is good, but certainly not even close in high gain mode. the cleans are better like this, but the high gain tones i'd say are 1/2 as good. maybe about the same as a JCM800. I'm going to have to make it switchable.
As to the joke about cooking, why would that even happen with LESS power? If it's going to get hot it should get hotter with more watts, no? I'm also still very confused, tho explaining why will likely confuse you more ! but here goes...
The amp redplated with two 270R's, one for each tube. I just realized, or at least it seems that by using one per tube the value is essentially halved so it would be like using a single 135R going to both cathodes tied together. Am i right so far?
If i am, then here are two things i don't understand. 1)-the 2 amps i mentioned are using two 270R's, which means 135R total. Isn't this stupid low for any EL34 amp with similar iron and other circuit values to mine? And 2)- and this one really confuses me....the amp sounded very different with one 270 than with 2 450's. But from what i mentioned above about the value being halved when 2 R's are used, i should have been doing the same thing with a 450 per each tube as with one 270 shared, no? this makes me think the only explanation is that using a seperate R per tube is a much richer sound, because the values were the same. But even if that were true it still doesn't explain the extra power the amp displayed both to my ears and via the calculator.
No doubt it's partially lack of communication between us because trying to discuss something like this in a forum is worlds tougher than in person. i appreciate you guys trying to help, but every reply generates more questions and by the time i get around to asking them you guys are already ahead of me and talking about other things. So yeah....i am cornfused !!!
As to the joke about cooking, why would that even happen with LESS power? If it's going to get hot it should get hotter with more watts, no? I'm also still very confused, tho explaining why will likely confuse you more ! but here goes...
The amp redplated with two 270R's, one for each tube. I just realized, or at least it seems that by using one per tube the value is essentially halved so it would be like using a single 135R going to both cathodes tied together. Am i right so far?
If i am, then here are two things i don't understand. 1)-the 2 amps i mentioned are using two 270R's, which means 135R total. Isn't this stupid low for any EL34 amp with similar iron and other circuit values to mine? And 2)- and this one really confuses me....the amp sounded very different with one 270 than with 2 450's. But from what i mentioned above about the value being halved when 2 R's are used, i should have been doing the same thing with a 450 per each tube as with one 270 shared, no? this makes me think the only explanation is that using a seperate R per tube is a much richer sound, because the values were the same. But even if that were true it still doesn't explain the extra power the amp displayed both to my ears and via the calculator.
No doubt it's partially lack of communication between us because trying to discuss something like this in a forum is worlds tougher than in person. i appreciate you guys trying to help, but every reply generates more questions and by the time i get around to asking them you guys are already ahead of me and talking about other things. So yeah....i am cornfused !!!
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iknowjohnny
- Posts: 1070
- Joined: Thu Apr 24, 2008 2:10 am
- Location: los angeles
Re: help calculating bias resistor
F this...i am so sick of this debug @rap.
Re: help calculating bias resistor
The HC 30 is 360VB+ (with the SSrectifier) 21V across the 270 cathode resistor on each tube giving you .078 current = (360-21) 339*.078 = 26.4W You can subtract 5ma fro the 1K screen resistors and would be 24.7W. I do think this is pushing it but they do not have a great reliability record on the power tubesiknowjohnny wrote:What i'd really like to understand is why not only the chieftain as i mentioned above, but now i see the bad cat also.....both have PA's almost exactly like mine except for the bypass caps. The chieftain is 40 watts and the hotcat is 30. Here are the specs...
I own one myself and that is one of my beefs besides the bleed between channels