Removing Two Power Tubes in the AD140HTC???
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<blockquote id="quote"><font size="1" face="Verdana, Arial, Helvetica" id="quote">quote:<hr height="1" noshade id="quote"><i>Originally posted by andrew darby</i>
<br />Why must you double the speaker load impedance? And if I did that, what would the new load impedance have to be?
<hr height="1" noshade id="quote"></font id="quote"></blockquote id="quote">
I did this last week. the day before a gig I had a power valve go - no.4 on the right hand side looking at the back of the amp. I spoke to Andy at Orange and he said to remove it and it's opposite partner - No.1 and then plug my 16Ohm Orange 4x12 into one of the 8 Ohm speaker outputs. Worked like a dream. A tiny bit quiter, but not really noticeable to be honest , certainly not at the level I usually play at (just over 8 on master, gain on full) All the real power on the AD140 comes between 9 & 10 and so I really didn't notice that much of a difference. A bit less Bass, but I normally dial the bass down to around 5, so all I did was dial the bass back up again.
I havn't got my new Power valves yet so havn't been able to do a direct comparison with/without, but It certainly worked for me on the night!
I was going to ask anyone wether this would have any serious effect on the amp if I keep it like this?
<br />Why must you double the speaker load impedance? And if I did that, what would the new load impedance have to be?
<hr height="1" noshade id="quote"></font id="quote"></blockquote id="quote">
I did this last week. the day before a gig I had a power valve go - no.4 on the right hand side looking at the back of the amp. I spoke to Andy at Orange and he said to remove it and it's opposite partner - No.1 and then plug my 16Ohm Orange 4x12 into one of the 8 Ohm speaker outputs. Worked like a dream. A tiny bit quiter, but not really noticeable to be honest , certainly not at the level I usually play at (just over 8 on master, gain on full) All the real power on the AD140 comes between 9 & 10 and so I really didn't notice that much of a difference. A bit less Bass, but I normally dial the bass down to around 5, so all I did was dial the bass back up again.
I havn't got my new Power valves yet so havn't been able to do a direct comparison with/without, but It certainly worked for me on the night!
I was going to ask anyone wether this would have any serious effect on the amp if I keep it like this?
ORANGE TILL I DIE!
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<blockquote id="quote"><font size="1" face="Verdana, Arial, Helvetica" id="quote">quote:<hr height="1" noshade id="quote"><i>Originally posted by andrew darby</i>
<br />Well I only have an 8 ohm mono cabinet, how do I double the speaker load impedance if the Orange only has 1x16 ohm speaker output and 2x8 ohm speaker output?
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to be honest - dunno. I must admit I don't really know how Ohm and impedence work.
<br />Well I only have an 8 ohm mono cabinet, how do I double the speaker load impedance if the Orange only has 1x16 ohm speaker output and 2x8 ohm speaker output?
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to be honest - dunno. I must admit I don't really know how Ohm and impedence work.
ORANGE TILL I DIE!
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<blockquote id="quote"><font size="1" face="Verdana, Arial, Helvetica" id="quote">quote:<hr height="1" noshade id="quote">(pwar66)
I did this last week. the day before a gig I had a power valve go - no.4 on the right hand side looking at the back of the amp. I spoke to Andy at Orange and he said to remove it and it's opposite partner - No.1 and then plug my 16Ohm Orange 4x12 into one of the 8 Ohm speaker outputs. Worked like a dream...
...I was going to ask anyone wether this would have any serious effect on the amp if I keep it like this?
<hr height="1" noshade id="quote"></font id="quote"></blockquote id="quote">No, that should be fine.
Andy.
I did this last week. the day before a gig I had a power valve go - no.4 on the right hand side looking at the back of the amp. I spoke to Andy at Orange and he said to remove it and it's opposite partner - No.1 and then plug my 16Ohm Orange 4x12 into one of the 8 Ohm speaker outputs. Worked like a dream...
...I was going to ask anyone wether this would have any serious effect on the amp if I keep it like this?
<hr height="1" noshade id="quote"></font id="quote"></blockquote id="quote">No, that should be fine.
Andy.
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Forgot to mention that you won't have much volume reduction as it'll only be 3Db- and this is what we are taught to understand as the MINIMUM the human ear can discern as a difference in volume level.
Forget "power tube break-up". By the time the power tubes break-up you'll be deaf and yer ears will bleed!
-Jon
Forget "power tube break-up". By the time the power tubes break-up you'll be deaf and yer ears will bleed!
-Jon
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Well, "let's get technical":
You have to double the speaker load as the Output Transformer interrupts the Plate Impedance of the output tubes in relation to the Turns Ratio of the OutPut Transformer to the Speaker Impedance. Thus in removing two of the four output tubes you double the Output Impedance of the Primary so you must double the impedance of the Secondary...
(It's about Turns Ratio...)
-Jon
You have to double the speaker load as the Output Transformer interrupts the Plate Impedance of the output tubes in relation to the Turns Ratio of the OutPut Transformer to the Speaker Impedance. Thus in removing two of the four output tubes you double the Output Impedance of the Primary so you must double the impedance of the Secondary...
(It's about Turns Ratio...)
-Jon
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