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Old 8th January 2010, 12:17 AM   #12
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Here is a good selection of schematics:


Last edited by dopkomachine; 8th January 2010 at 12:29 AM.
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Old 10th April 2010, 10:08 AM   #13
djk is offline djk
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Server not found

Firefox can't find the server at www.tubebuilder.com.
Candidates for the Darwin Award should not read this author.
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Old 10th April 2010, 12:51 PM   #14
alecu7 is offline alecu7  Canada
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Originally Posted by djk View Post
Server not found

Firefox can't find the server at www.tubebuilder.com.

Same here.
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Old 27th December 2010, 05:11 PM   #15
M Gregg is offline M Gregg  England
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Default Loose tube bases.

This seems to work well,

Loose Tube Bases

I used clear nail varnish worked quite well on 6L6G Brimar.
Thank's Ty_Bower.

M. Gregg
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Old 27th December 2010, 05:36 PM   #16
igaar is offline igaar  United States
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Finger nail polish! I use that to fix tears and glue down old spiders back to the magnets as well in speakers that have seen better days, any color will work by the way. Something else that could be good for tube bases is "slow drying super glue" it can be bought at the hardware store like Ace or one of the other chains.
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Old 25th February 2011, 07:10 AM   #17
radio is offline radio  Macedonia
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Location: Bitola MACEDONIA
Smile High End preamplifier with ECC82!

The measurements refer to the preamplifier is given below in Scheme (Figure 1)!
Please someone let that little comment about this preamplifier, if it does as a power preamplifieramplifier.
Feedback to be about the sound and display measurements if it worked.
If someone izradijo this pretpoačalo and made some measurements and some show here (frequency response and attitude towards the second and third harmonic!!?)
Many thanks in advance!
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Old 5th March 2011, 11:56 PM   #18
kevinkr is offline kevinkr  United States
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Zigzagflux's thread on FFT measurements performed on his system: D/A preamp FFT measurements for review plz for persistence and methodology. Quality of all responses is also excellent.
"To argue with a person who has renounced the use of reason is like administering medicine to the dead." - Thomas Paine
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Old 2nd September 2011, 04:13 PM   #19
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Location: Alps:Tube amp designs over 150W, SMPS guru.
SOme wondered how that that BiG 200+200W parallel p-p project is going; pic of the business end. It may look horrendous but it's in order. In all about 9 months work in evenings the 100KHz SMPS taking up alot of development time. Some wiring needs tidying up but in the most part the 750W SMPS (within square can) with dual voltage boost power supply runs as expected as do the supplementary power boards; all with hot logic switching and watchdog detection, with programmable stage USB interface.
This is systems engineering complexity, so this project isn't for first timers nor beginners as considerable RF experience is required. The power amp circuit is remarkably basic; capable of bridge mode operation but it's the safety aspect of the very low impedance power supply draws attention to protection. Many don't like SMPS in power amps supplies; the advantage of excellent regulation is a real plus for dynamics.
Some features:-
AC soft start; duff cable and brownout jerk hiccup; 360V intermediate driver stabilised B+; logic controlled auto switching B- with hi & lo power with programmed B+ droop for MI; auto cathode current monitoring (important in bridgemode); large tolerance AC operation; wideband input transformers; DC front end heater; watchdog bias and overvoltage failure protection. Channel separation guaranteed -70dB at 15KHz; hi power thd 0.1% at 200W & lo power 0.05% at 35W.
This amp represents a considerable investment in old and new concepts.

Next to come; in a few weeks time, the complete power running spec with photo.

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Old 2nd September 2011, 04:39 PM   #20
SY is offline SY  United States
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I am sincerely impressed!
"You tell me whar a man gits his corn pone, en I'll tell you what his 'pinions is."
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