The Sounds of LS 3/5A
The Sounds of LS 3/5A Vol 2
$24.00
1. Mozart, arr. Savall: Alla turca. Allegretto
2. Bocini: Ballata No.3
3. Gershwin: Fascinating Rhythm
4. Vivaldi: L'Inverno (Winter) – Allegro
5. Handel: Lascia ch’io pianga (from Rinaldo)
6. Monti: Czadas
7. Lowe/ Turk/ Mike, arr. Mealey :Medley: Teddy Bear/ Are You Lonely Tonight/ Treat Me Nice
8. La Luze De Oro (musica Philippe Eidel/ poesia Biagio Marin)
9. Falla: Introducciò y danza del Corregidor
10. You Belong to Me
11. Bizet: L’Arlésienne, Suite No. 2, Op. 23: III. Menuet
12. Sur ce chemin (On This Path)
13. Farbay di Teg (Those Were The Days)
$24.00
1. Mozart, arr. Savall: Alla turca. Allegretto
2. Bocini: Ballata No.3
3. Gershwin: Fascinating Rhythm
4. Vivaldi: L'Inverno (Winter) – Allegro
5. Handel: Lascia ch’io pianga (from Rinaldo)
6. Monti: Czadas
7. Lowe/ Turk/ Mike, arr. Mealey :Medley: Teddy Bear/ Are You Lonely Tonight/ Treat Me Nice
8. La Luze De Oro (musica Philippe Eidel/ poesia Biagio Marin)
9. Falla: Introducciò y danza del Corregidor
10. You Belong to Me
11. Bizet: L’Arlésienne, Suite No. 2, Op. 23: III. Menuet
12. Sur ce chemin (On This Path)
13. Farbay di Teg (Those Were The Days)
EL34 Dynaco Stereo 70 fault
- By Nemeske
- Tubes / Valves
- 25 Replies
Dear Forum,
I assume that my tube's gotten out, as out of nothing I heard a hum getting louder from my QUADs right channel.
I immediately turned off my amplifier. Checked the biaset's 1,56, whereas after turning on the amp, the left side stated 1,56 correctly after about 1 min, but the faulty right channel didn't stop at 1,56 but started to rise uncontrable, and around 3,00V, the 'faulty' tube's plate started to glow.
What do you think could be the problem? A friend of mine advised me to oversolder all the legs of the tube, that it could be some kind of miscontact.
Anyway, I am planning to swap all the four power tubes, so ordering a quad of el34s, but I have no idea which four should I buy.
I read pros and cons about the Russian Mullards, JJs and other manufacturers products. I have no coverage now for NOS solutions.
My question is that if you have any requirements, experience with these new EL 34's, and could suggest a manufacturer or a good NOS cost/performance ratio set for me.
Thank you for your help in advance!
I assume that my tube's gotten out, as out of nothing I heard a hum getting louder from my QUADs right channel.
I immediately turned off my amplifier. Checked the biaset's 1,56, whereas after turning on the amp, the left side stated 1,56 correctly after about 1 min, but the faulty right channel didn't stop at 1,56 but started to rise uncontrable, and around 3,00V, the 'faulty' tube's plate started to glow.
What do you think could be the problem? A friend of mine advised me to oversolder all the legs of the tube, that it could be some kind of miscontact.
Anyway, I am planning to swap all the four power tubes, so ordering a quad of el34s, but I have no idea which four should I buy.
I read pros and cons about the Russian Mullards, JJs and other manufacturers products. I have no coverage now for NOS solutions.
My question is that if you have any requirements, experience with these new EL 34's, and could suggest a manufacturer or a good NOS cost/performance ratio set for me.
Thank you for your help in advance!
Rectifier capacitor and rating query
- By Smiffy
- Power Supplies
- 2 Replies
Hi All
Just giving a Musicl Fidelity F16 a clean u and renewing main caps as they are dry as a bone(never heard a capacitor rattle before)
Looked at rectifier and noticed no caps across diodes to absorb switching noise but Philips orange drop caps wired up like this
Have seen caps across ac inputs before but never ac to ground
Anyone any ideas why its like this?
Ta for any info
John
Just giving a Musicl Fidelity F16 a clean u and renewing main caps as they are dry as a bone(never heard a capacitor rattle before)
Looked at rectifier and noticed no caps across diodes to absorb switching noise but Philips orange drop caps wired up like this
Have seen caps across ac inputs before but never ac to ground
Anyone any ideas why its like this?
Ta for any info
John
Ghost resonance
- By Viper_user
- Multi-Way
- 21 Replies
Hi!
Anyone familiar with Ghost resonance? A hardening effect with L-R 24db slopes.
Some info from Lenard Audio
Anyone familiar with Ghost resonance? A hardening effect with L-R 24db slopes.
Some info from Lenard Audio
A mid speaker crossed over in isolation. 2nd order 12dB/octave crossovers attenuate the music without hearing a tone or colour change. Higher order crossovers attenuate the music causing a subtle but noticeable tone or colour change (hardening) in the music. When recombined with the other speakers this tonal change is not directly noticeable.
Crossover distortion
Active Crossover are created by electronic L. C. resonant circuits, or software digital assimilations of them. The slopes of crossovers represent a part (one side) of a resonant note. This note is not heard directly, but the steep slopes of third and fourth order crossovers can reflect harmonic interference (sideband distortion) within the music. Early research referred to this ghost resonance as transient distortion. Conclusive research in this area has not been completed.
Crossover distortion
Active Crossover are created by electronic L. C. resonant circuits, or software digital assimilations of them. The slopes of crossovers represent a part (one side) of a resonant note. This note is not heard directly, but the steep slopes of third and fourth order crossovers can reflect harmonic interference (sideband distortion) within the music. Early research referred to this ghost resonance as transient distortion. Conclusive research in this area has not been completed.
Wire before Caps out
- Analog Line Level
- 6 Replies
Should i put C1 and C2 a cap?
Is it ok to put power DC 18v and Audio in the same cable?
im looking for low noise. i just only need 1uf. 1uf film is so big in my space but if necesarry i will put two each side.
Attachments
The Frugel-Horn Project
- By planet10
- Full Range
- 1227 Replies
i have just put up the Frugel-Horn Project page... and the 1st alpha version may be playing music by the end of the weekend.
http://www.planet10-hifi.com/frugel-horn.html
dave
http://www.planet10-hifi.com/frugel-horn.html
dave
FS: Padden CS4398 transformer coupled DAC
built by Ed Padden - sturdy case - USB and coax SPDIF input. Edcor transformers - $135 shipped CONUS. Paypal only.
120Hz hum in my amp, and here is a scope picture.
- By Hextejas
- Equipment & Tools
- 21 Replies
Attachments
TL431 as CCS for phase inverters or cathode resistor.
- By CaterpilarSK
- Tubes / Valves
- 8 Replies
Attachments
Tang Band W6-1914SB as a Fullrange?
- By xrk971
- Full Range
- 3 Replies
What do we know about the W6-1914SB? I ran across this 6in honeycomb diaphragm neodymium motor midrange today. I looked at the response curve and it seems wide and flat and with decent sensitivity. I think it won’t make much bass but could be a good top for a FAST/WAW.
Data sheet:
https://www.parts-express.com/pedocs/specs/264-905--tang-band-w6-1914sb-spec-sheet.pdf
Code:
Resonant Frequency (Fs)70 Hz
DC Resistance (Re)6.5 ohms
Voice Coil Inductance (Le)0.073 mH
Mechanical Q (Qms)7.19
Electromagnetic Q (Qes)0.37
Total Q (Qts)0.35
Compliance Equivalent Volume (Vas)0.39 ft.³
Mechanical Compliance of Suspension (Cms)0.399 mm/N
BL Product (BL)10.23 Tm
Diaphragm Mass Inc. Airload (Mms)13.97g
Maximum Linear Excursion (Xmax)0.5 mm
Surface Area of Cone (Sd)140 cm²Data sheet:
https://www.parts-express.com/pedocs/specs/264-905--tang-band-w6-1914sb-spec-sheet.pdf
Overview X-XA-XS-Power Amp Series - Elcaps using both in large and small Outline-why?
- Pass Labs
- 23 Replies
Attachments
FS: 1 pair sealed can 50Hy 30mA 1K ohm DCR filter chokes
nice little chokes for those low current tube demands
$45 a pair including shipping in a medium ($15.05) Priority box.
screw spacing ~ 1 5/8"
Paypal only
$45 a pair including shipping in a medium ($15.05) Priority box.
screw spacing ~ 1 5/8"
Paypal only
Marantz PM7200 repair: lacks power?
- By mossieurclo
- Solid State
- 29 Replies
Allô everyone, thanks for this forum and your attention.
This Marantz PM7200 cuts out the sound on both channels for a half a second on transients, and recovers. Until the next transient.
It will do it as well on not very dynamic music with volume pushed, at the slightest peak.
It does that on any source. It does it running in class A. It does it with "source direct" selected (no bass/treble controls). With that Tone Board in function, cutting the bass lessens the problem.
So my first thought was: lack of power reserves, so, bad capacitors?
(Amp draining test tune: Schonherz & Scott "wishing well" on Windham Hill https://www.youtube.com/watch?v=BAwxJg7mEr8)
And it also does it on headphones (Sennheiser HD518, 50ohms), no speakers fed. Which is a big relief as it takes the lovable Elipson 1303 out of the equation.
No hum, no relay clicks when sound cuts, no thumps from speakers, no hiss, no distortion.
As for distortion, i hear a certain "granularity", but i usually evaluate sound quality wearing headphones, and that headphone test was done playing a .mp3 from a Samsung phone...
(((
(i moved the Marantz to the bench to sneak inside. Replaced it (only to hear the Linux Pc used to stream live Radio-Canada 'cause we can't afford the Cable/Satellite Scam) with given to me STK powered Pioneer VSX515. Please everyone use that as last resort. It's awfull...even without headphones)
)))
...so i don't rely on that. Add to that that i don't hear much above 10Khz.
As for relay clicks, i can hear a couple relays clicking on power up sequence, but the speaker relays clicks are very faint. Maybe these click when the sound cut happens and i don't hear them. Anyways the sound always resumes after .5second without cycling Power, until the next transient.
On speaker out (without speakers plugged, no input, Vol at Min) i measured -2mv DC on R, -20mv on L. Same in class A. I did not do the other measurement (quiescent current?) yet, i need probe clips for those hard to reach test points.
On visual inspection (no dismantling, though) i didn't see any burns, bad traces, or bulging or obviously leaking caps. I only saw 2 suspect electrolytic capacitors, with whitish powder nearby on the board or on top. #2203 and #2204 (470mF and 2002mF) on the Tone Board.
And i was surprised to see on the schematic (if i'm reading right) that AC (what voltage??) is fed to that ToneBoard, direct from the main transfo, going through 4 rectifier diodes and to those 2 caps. So i wonder if they can be involved (if bad) and how, as the sound cut happens even with that ToneBoard out of the signal path (source direct).
That fault developped and got worse with time. It was not there when i first used the amp (bought used, 2-3?? years ago). Which makes me hope that some weakness was already present whaen i first played it, for i immediately missed my precedent music companion HarmanKardon PM660. The Marantz lacked the "Ooumph" (what a nicely eloquent audiophile term ;-) ). I was even more sorry when i played a vinyl on it, but i now know i can correct that wrong capacitance on the input, thanx to knowledgable inhabitants of these forums (fora? fori? forae? pardon my poor Latin).
I should also mention that i seldom put the marantz on Standby, it was On 24/7
<slapping own fingers>.
I researched bad capacitors (i now know how to discharge before testing, for one thing) and sound cutting and related stuff for a week. Apart from surface mount, i can manage a soldering iron (i remember replacing diff pairs on the HK, the Marantz will be a joy to work in) and multimeter and basic safety measures (grrr, i need probe clips), so throw it at me ;-)
Sorry for the verbose precision, i think i told you all i observed.
And thank you all for your insights and help.
service manual:
https://www.hifiengine.com/hfe_downloads/index.php?marantz/marantz_pm7200_service.pdf
This Marantz PM7200 cuts out the sound on both channels for a half a second on transients, and recovers. Until the next transient.
It will do it as well on not very dynamic music with volume pushed, at the slightest peak.
It does that on any source. It does it running in class A. It does it with "source direct" selected (no bass/treble controls). With that Tone Board in function, cutting the bass lessens the problem.
So my first thought was: lack of power reserves, so, bad capacitors?
(Amp draining test tune: Schonherz & Scott "wishing well" on Windham Hill https://www.youtube.com/watch?v=BAwxJg7mEr8)
And it also does it on headphones (Sennheiser HD518, 50ohms), no speakers fed. Which is a big relief as it takes the lovable Elipson 1303 out of the equation.
No hum, no relay clicks when sound cuts, no thumps from speakers, no hiss, no distortion.
As for distortion, i hear a certain "granularity", but i usually evaluate sound quality wearing headphones, and that headphone test was done playing a .mp3 from a Samsung phone...
(((
(i moved the Marantz to the bench to sneak inside. Replaced it (only to hear the Linux Pc used to stream live Radio-Canada 'cause we can't afford the Cable/Satellite Scam) with given to me STK powered Pioneer VSX515. Please everyone use that as last resort. It's awfull...even without headphones)
)))
...so i don't rely on that. Add to that that i don't hear much above 10Khz.
As for relay clicks, i can hear a couple relays clicking on power up sequence, but the speaker relays clicks are very faint. Maybe these click when the sound cut happens and i don't hear them. Anyways the sound always resumes after .5second without cycling Power, until the next transient.
On speaker out (without speakers plugged, no input, Vol at Min) i measured -2mv DC on R, -20mv on L. Same in class A. I did not do the other measurement (quiescent current?) yet, i need probe clips for those hard to reach test points.
On visual inspection (no dismantling, though) i didn't see any burns, bad traces, or bulging or obviously leaking caps. I only saw 2 suspect electrolytic capacitors, with whitish powder nearby on the board or on top. #2203 and #2204 (470mF and 2002mF) on the Tone Board.
And i was surprised to see on the schematic (if i'm reading right) that AC (what voltage??) is fed to that ToneBoard, direct from the main transfo, going through 4 rectifier diodes and to those 2 caps. So i wonder if they can be involved (if bad) and how, as the sound cut happens even with that ToneBoard out of the signal path (source direct).
That fault developped and got worse with time. It was not there when i first used the amp (bought used, 2-3?? years ago). Which makes me hope that some weakness was already present whaen i first played it, for i immediately missed my precedent music companion HarmanKardon PM660. The Marantz lacked the "Ooumph" (what a nicely eloquent audiophile term ;-) ). I was even more sorry when i played a vinyl on it, but i now know i can correct that wrong capacitance on the input, thanx to knowledgable inhabitants of these forums (fora? fori? forae? pardon my poor Latin).
I should also mention that i seldom put the marantz on Standby, it was On 24/7
<slapping own fingers>.I researched bad capacitors (i now know how to discharge before testing, for one thing) and sound cutting and related stuff for a week. Apart from surface mount, i can manage a soldering iron (i remember replacing diff pairs on the HK, the Marantz will be a joy to work in) and multimeter and basic safety measures (grrr, i need probe clips), so throw it at me ;-)
Sorry for the verbose precision, i think i told you all i observed.
And thank you all for your insights and help.
service manual:
https://www.hifiengine.com/hfe_downloads/index.php?marantz/marantz_pm7200_service.pdf
