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Amp Internals 2

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valve head777 View Drop Down
Old Croc
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Post Options Post Options   Thanks (0) Thanks(0)   Quote valve head777 Quote  Post ReplyReply Direct Link To This Post Posted: 06 May 2015 at 11:37pm
Originally posted by Earplug Earplug wrote:

I bet that kept the room warm.  Smile

lol, when it's at full and saturating it gets pretty hot, but the tx's stay cool. It's used as part of a hybrid system, my big amps get its signal so it's valve bass but with today's power. It's happiest running silly loads, as it was built to run many four-face reggae bass cabs.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Dub Specialist Sound Quote  Post ReplyReply Direct Link To This Post Posted: 07 May 2015 at 10:29am
Very very nice valve man

i need to learn more about valve amps...
Musical Roots Reggae Vibration is Life! for music is sound...sound is vibration...vibration is energy... and energy begets life. Therein lies my passion!...MUSIC IS LIFE...
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Earplug Quote  Post ReplyReply Direct Link To This Post Posted: 07 May 2015 at 1:41pm
Earplugs Are For Wimps!
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valve head777 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote valve head777 Quote  Post ReplyReply Direct Link To This Post Posted: 07 May 2015 at 4:21pm
Originally posted by Earplug Earplug wrote:

Good starter here:

http://education.lenardaudio.com/en/14_valve_amps.html


lol, just read it and agree. I do have a leak stereo 20, but i'm no valve snobLOL. Hey Dub Specialist, maybe design a S.E.T and make a Sh1ts worth of money from morons??Wink
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Post Options Post Options   Thanks (0) Thanks(0)   Quote shaun1264 Quote  Post ReplyReply Direct Link To This Post Posted: 10 May 2015 at 1:14pm
Crown Macro Reference 1.  Built December 1994
















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Post Options Post Options   Thanks (0) Thanks(0)   Quote doller Quote  Post ReplyReply Direct Link To This Post Posted: 12 May 2015 at 7:25am
Myths.   To appreciate valve amplifier technology we must first be-bunk audiophile myths that in-correctly describe them.   Many Audiophiles believe in alchemy and behave similar to religious cults.   Cult driven audiophiles are easily identified by their repetitious chanting of brand names, model numbers and meaningless superlatives concocted by high priest reviewers and marketing spin doctors.   The highest Deity worshiped by the occult .
 
Classic !!!!! never read that on an amp page before.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote flinnt45 Quote  Post ReplyReply Direct Link To This Post Posted: 12 May 2015 at 9:37am
Hey Valve head

Do you know what the plate to plate impedance of the output transformers primary is? and what current output is the mains transformer rated for?, I have done a lot of research on this type of amp and I ask because some very interesting design concepts were used and the piece is probably capable of a lot more than 600 watts.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote valve head777 Quote  Post ReplyReply Direct Link To This Post Posted: 12 May 2015 at 11:11am
Originally posted by flinnt45 flinnt45 wrote:

Hey Valve head

Do you know what the plate to plate impedance of the output transformers primary is? and what current output is the mains transformer rated for?, I have done a lot of research on this type of amp and I ask because some very interesting design concepts were used and the piece is probably capable of a lot more than 600 watts.
Hi Flinnt45, I don't know what the plate to plate impedance, but the mains tx is rated at 750v @ 1.5 amps (as far as I remember!). the ECC81 has a hard time driving the output stage though, and modulates the frequency at full power on the lowest notes. We have it running, but haven't re fangled the output tx yet. I'll ask my engineer what the p to p impedance is. Smile
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Post Options Post Options   Thanks (0) Thanks(0)   Quote flinnt45 Quote  Post ReplyReply Direct Link To This Post Posted: 12 May 2015 at 11:46am
Hey valve head
Based on your information re the mains TX your amp is not what I would call an impedance tricker, I assume 750v @1,5 amps is what is available after rectification, prior to its about 2 amps and somewhere around 530v if full wave bridged, your tubes,s need 150ma a piece=1.8 amps plus a bit of headroom, so preferably 2.4 amps after rectification, I know that in push pull only half the tubes are on and half the tubes are off during operation and that's fine for a hi fi amp but at the crossover point all of the current is required and I suspect this may be why your amp modulates-it runs out of current, your primary impedance is somewhere around 750 ohms for the output TX,try to match your speaker loads on the secondary with this amp as I believe its designed this way, what you describe as saturation is the power supply causing distortion-classic overdrive, perhaps it was designed to give this over driven Bass sound-there is much more performance available from the amp as you describe it. I also assume that you have input, phase splitter, then cathode follower?, if not and its just an input tube then the phase splitter try swopping out the ecc81 for an 82.
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valve head777 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote valve head777 Quote  Post ReplyReply Direct Link To This Post Posted: 12 May 2015 at 1:11pm
Originally posted by flinnt45 flinnt45 wrote:

Hey valve head
Based on your information re the mains TX your amp is not what I would call an impedance tricker, I assume 750v @1,5 amps is what is available after rectification, prior to its about 2 amps and somewhere around 530v if full wave bridged, your tubes,s need 150ma a piece=1.8 amps plus a bit of headroom, so preferably 2.4 amps after rectification, I know that in push pull only half the tubes are on and half the tubes are off during operation and that's fine for a hi fi amp but at the crossover point all of the current is required and I suspect this may be why your amp modulates-it runs out of current, your primary impedance is somewhere around 750 ohms for the output TX,try to match your speaker loads on the secondary with this amp as I believe its designed this way, what you describe as saturation is the power supply causing distortion-classic overdrive, perhaps it was designed to give this over driven Bass sound-there is much more performance available from the amp as you describe it. I also assume that you have input, phase splitter, then cathode follower?, if not and its just an input tube then the phase splitter try swopping out the ecc81 for an 82.
Thanks for the info Flinnt, I'll pass it on to the engineer. the mains tx has the 750v 1.5a rating written on it so maybe abit less power than thought? the ultimate power output is not critical as it only drives speakers to load the amp, and the main sub power for the dance comes from bigger transistor amps fed from a matching tx.
Thanks for your input, would love to hear your setup too.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote flinnt45 Quote  Post ReplyReply Direct Link To This Post Posted: 12 May 2015 at 3:23pm
Hey valve head
If I understand you correctly your amp has been deliberately designed to drive slave amps, would love to study the design, how it is put together etc, will let you know when I am out with the set, have done a few things with it but will have a serious test in july, with a view to a gig over carnival week end, please keep up with my post in the amp forum, I am posting a 600 watt amp build there-will be updated once a week-only work on them at the week ends.
JAH Kreator Hi Fi
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Post Options Post Options   Thanks (0) Thanks(0)   Quote valve head777 Quote  Post ReplyReply Direct Link To This Post Posted: 12 May 2015 at 4:20pm
Originally posted by flinnt45 flinnt45 wrote:

Hey valve head
If I understand you correctly your amp has been deliberately designed to drive slave amps, would love to study the design, how it is put together etc, will let you know when I am out with the set, have done a few things with it but will have a serious test in july, with a view to a gig over carnival week end, please keep up with my post in the amp forum, I am posting a 600 watt amp build there-will be updated once a week-only work on them at the week ends.
Thanks Flinnt, will check that out. Hope to have not confused the issue on being a slave amp driver- the amp was built by Mr Eddy to drive many drivers, the matching tx was my idea so I can achieve the bass sound I want.
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