Headphone amps

Need to get back into headphone listening as moving flats, gonna buy a pair of Sennheiser hd650, as I see them at low offers, around £200, seems good value. Now I suppose I have to fork out £££sss for an amp to drive them? I use a Sudgen A21L as my main amp, but it has no headphone socket, darn.

 

Hi,
I could suggest another Sugden - a Bijou Headmaster? However, there is no reason why you can't continue with the A21 - just make a hybrid box to terminate your Sugden into, in place of your loudspeakers and "tap - off" some drive to a headphone socket to plug in your headphones.

Your Amplifier is brilliant as it is. But if you drive a decent set of headphones from it, you will see another level of performance you never thought it had.

It will beat anything you can buy, without spending a King's Ransom - unless you can find a Headmaster.

 

Thanks, how on earth do I do that?

 

Easy - genuinely easy. The simplest of ways, assuming you haven't bought any Sennheiser's yet is to buy a pair of Electrostatics. You could find a decent pair of second-hand with the energiser. Or splash out and buy some new ones - they really don't deteriorate like conventional headphones. My Stax are now over fifty years old and still sublime.

Alternatively, make up two 8 ohm resistors - rated at the power output of the Sugden and terminate your amplifier loudspeaker outputs into them. Then it is simply a matter of "Tapping - off", sufficient drive to power your headphones, via a "Jack".

To make life easy for yourself, you could always contact Sugden who, no doubt have been asked the same question a zillion times. You will find then very obliging.

Frankly however, if the A21 were mine, there is no question, if it has to be headphones, it would be Stax.

 

So you can use teh Stax straight into the Sugden?

 

Yes,

They have anything form 250 to 500 volts charge on the electrostatic elements. This, depending upon which model, is derived from, in my case, a SRD - 5 energizer. It is very, very low current so there is no risk. The SRD - 5 is powered from the mains. The left and right loudspeaker outputs from your A21, or in my case my 303, 495 or 909 connect into the SRD - 5, into which the headphones also plug.

It is difficult to make a subjective comparison with any loudspeakers, except perhaps the original Quad Electrostatics which have "Full - Range" elements, just as the Stax have. This means no cross-over networks and thus extremely fine "Phase - Response", right across the whole audio spectrum. Indeed Quad's ELS were used and perhaps still are, as a reference by conventional loudspeaker designers/manufacturers.

My Spendors have just been fitted with new original drivers and their performance is superb at modest power levels. Yet, when compared to my SR3 Stax headphones, the only advantage they have is, one is not tied down by a headphone lead.

In addition, my Sugden Headmaster was bought for the very same reason you intend - we will be downsizing to a smaller property. The Headmaster is a Pure Class A Headphone/Pre-amp and having had an original Sugden decades ago, I knew just how good they are. However, as yet I do not have a pair of headphones to plug into the Suggie so, I dug out my SR3's

They were brilliant driven by my 303 and 405. However, I wondered if I could "beat the system" by using the 405 at low levels to keep it operating in Class A, as the Sugden does. Sadly, there wasn't sufficient power, but that provoked me into speculating the 909 would operate in Class A to a higher level.

It is all very fortunate for me as most of what has gone on was totally unplanned. The net result is a brace of amplifiers, the Suggie and the 909, with extremely low noise; of particular importance when playing music at very low levels, an almost unrivalled dynamic range and an "Attack" which is swifter than a rifle shot (figuratively speaking).

The driver behind all this is my obsession with Class A, without the means to afford a top of the range Sugden. The Quad 909 however, makes a pretty good substitute - if not quite the real deal.

As for your Sugden, were it mine - I would not part with it, "For All The Tea In China".