Hello, everybody!
If it's not much of a trouble, please, a question:
For a Single Ended vacuum tubes amplifier of maximum 5 Wpc, considering that the drivers have a quite high SPL, which is better: seales or vented enclosure? (And, for esthetical reasons, a 2 way)
Thank you all in advance for the answers
If it's not much of a trouble, please, a question:
For a Single Ended vacuum tubes amplifier of maximum 5 Wpc, considering that the drivers have a quite high SPL, which is better: seales or vented enclosure? (And, for esthetical reasons, a 2 way)
Thank you all in advance for the answers
It doesn't necessarily 'need' it; depends on the drivers. What you would certainly need to do though is factor the output impedance of the amplifier into the design (notably the change in effective Qts) and assess from there whether a vented load is viable or not. In some cases it won't be; in both cases, all other things being equal, box size will be significantly larger than with a voltage source with only typical wire loop, connection resistance and any relevant DCR of passive filtering in circuit.
Typical sealed or vented speakers are designed for near zero ohm output impedance amplifiers.
Neither sealed nor vented speakers will work as designed with a relatively high output impedance Single End Vacuum Tube amplifier.
Neither sealed nor vented speakers will work as designed with a relatively high output impedance Single End Vacuum Tube amplifier.
if you drive the speaker hard vented can give over excursion of cone.
sealed will be better driven hard.
sealed will be better driven hard.
Sorry, but I don't quite understand
What you're trying to say is that no matter what simulation program one uses to design a speaker, in the end that forementioned speaker, under real life conditions, won't work as designed?
What you're trying to say is that no matter what simulation program one uses to design a speaker, in the end that forementioned speaker, under real life conditions, won't work as designed?
Depends on frequency. At the vent tuning frequency, driver excursion is lower than a sealed enclosure. With a low tuning frequency and avoiding playing subsonic content, excursion is overall lower.
I would try to measure output impedance of that SET and then deisgn from there. Many simulation programs can take amp output impedance into account.
Chances are big that you could desingn something with a lower Q driver than you would use if you were driving it with an SS amp.
Regards
Charles
Chances are big that you could desingn something with a lower Q driver than you would use if you were driving it with an SS amp.
Regards
Charles
The amplifier in question seems to use EL34s. Looking at the output characteristic of a triode-connected EL34, and assuming an output transformer with a 3k primary, and 8 ohm secondary, output impedance will be around 1.5 ohms.
This can be factored into box calculations (for instance, Qts of a driver with a 6 ohm voice-coil resistance will increase by a factor of 25%).
This can be factored into box calculations (for instance, Qts of a driver with a 6 ohm voice-coil resistance will increase by a factor of 25%).
That is correct, the software assumes a near zero output impedance amplifier.
Thanks DT
Greets!
SE means no feedback to me, so if you want the most extended [bass] range it must be vented tuned to Fs; the amp will 'track' the two equal impedance peaks, 'filling in' the null between them somewhat for a subjectively 'full' bass extension and can be 'critically' damped if there's any audible 'ringing' with an impulse response such as the pioneer's 'click' test: Click Test | GM210 | Flickr
If wanting it performing like a sealed box, then tune a bit lower as required to reduce the amplitude of the second peak to get some of the best of both types.
GM
Thank you all for the inputs but, the discussion is getting so technical, that I donrealize how limited my knowledge is.
Thank you again
Thank you again
FWIW, could only find a 6 W Boyuu Reisong A10 with 4, 8 ohms** listed output impedance, so could be a matching impedance design or just tap values, so need to confirm which it is [hope for the former]: Reisong A10 EL34B tube amp Single-end Class A HiFi audio amplifier Boyuurange : China-hifi-Audio online store, Yaqin,Meixing Mingda,XiangSheng,Line Magnetic Tube Amplifier, power amp, preamp,hi-fi CD Player high end audio for sale [MUIA9831300] - $199.99 USD
Specifications:
Output Power: 6W * 2 (Ultra-linear).
Frequency response: 20Hz - 28KHz.
Output Impedance: 4,8Ω.
Total harmonic distortion: ≤ 1% (1kHz).
SNR: 88dB.
Voltage amplification: 6N2J × 2.
Power output tube: Dawn export EL34B × 2.
Rectifier tube: 5Z4PJ × 1.
Input sensitivity: 750MV.
Input impedance: 100KΩ (2 groups input)
Dimensions (W × D × H): 310 × 268 × 165mm.
Power Supply Voltage: AC 100V - 240V / 50Hz-60Hz (100V, 110V, 120V, 230V, 240V version will take 3-14 work days to order), 220V version is in stock.
edit: **
GM
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You're welcome!
Look at it this way, the pioneers conceived this type amp, then designed the cab type
GM