Myryad T-40 amplifier

I traded a pair of Energy 22 speakers for a Myryad T-40 amplifier from the late 1990's. The Rotel 840-BX has been a staple amplifier in my system since I bought it new in 1985. Like the Rotel the Myryad is straight line design with no tone controls.

The Rotel was rated at 40 watts per channel with 8200uf caps and the Myryad is rated at 50 Watts per channel with 10,000uf caps, providing the same headroom or a bit more.

The sound with the Myryad is very similar to the Rotel on the bottom and high end but the Myryad seems a little more fuller in the midrange and perhaps a little more control in the bass.

So far I have paired the Myryad up with the Pioneer HPM-60's, the Dual CL390's, the Paradigm Control Monitors and the Mission 770's. Of course the amplifier brings out the best in the Mission 770's and the Dual CL390's.

To my ears I hear the extra detail in the music with the Myryad amp. Being close to 30 years old the Rotel amp will be sent off for a refresh, replacing the caps at this point in it's life.

Paradigm Control Monitors

A pair of Paradigm Control Monitors came my way today, these are absolutely stunning speakers in a beautiful oak veneer, they arrived with the speaker stands and high end speaker wire.

Judging by the Hammered tone front it looks like these speakers were market towards the higher end Mission 770 line from the late 1980's. 

I have had about an hour with them so far and they sound superb...these will be sticking around for a while.

Heathkit AR-1214 update

I have had a solid couple of days listening to the Heathkit amplifier coupled with the various speakers including the Pioneer HPM-60's Energy 22's, Sony SS-E70's, JPW AP1's, the Audio Spec Perseus and the Mission 770 Freedom 5's.

The Heathkit sounds best with the Mission 770's as this amp needs an efficient pair of speakers to bring out the best of it's 15 watts per channel.

The sound is reminiscent of the Dynaco 80 amp that I had the use of for a short period of time, all the bass is there with a bight more brightness in the high end.

Very impressed with this little receiver.

Heathkit AR-1214

I picked up an early 70's Heathkit AR-1214 receiver today that was in pretty mint condition. The pots needed to be cleaned out to remove the static build up. The tuning is a bit off on the FM dial but every station comes in clear as a bell.

Right now it is powering my Audio Spec Perseus speakers in my office and I really like the sound stage, surprisingly deep and warmth. Next I will try them with the Pioneer HPM-60's.

The Heathkit AR-1214 specifications are as follows:

Amplifier Section:
Power Output:  15 Watts RMS (8 Ohm Load), 20 Watts (4 Ohm Load)
Power Bandwidth:  5 Hz to 30 kHz (< 0.5% THD)
Frequency Response:  7 Hz to 100 kHz (+/- 1 dB)
Harmonic Distortion:  < 0.5% (@ 15 Watts output)
Damping Factor:  > 30
Hum and Noise:  -60 dB
Channel Separation:  55 dB

FM Section:
Tuning:  88 to 108 MHz
IF:  10.7 MHz
Frequency Response: 20 to 15 kHz (+/- 1 dB)
Sensitivity:  2 uV
Selectivity:  60 dB
Image Rejection:  50 dB
IF Rejection:  75 dB
Capture Radio:  2 dB
AM Suppression:  50 dB
Harmonic Distortion:  0.5%
Inter modulation Distortion:  0.5%
Hum and Noise:  60 dB
Spurious Rejection:  70 dB

AM Section:
Tuning:  535 to 1620 kHz
IF:  455 kHz
Sensitivity:  100 uV
Selectivity:  40 dB
Image Rejection:  75 dB
IF Rejection:  60 dB
Harmonic Distortion:  2%
Hum and Noise:  35 dB

JPW AP1 versus Mission 700S

A little comparison on the these two speakers for the past few hours.

JPW is a little tighter on the bass due to the acoustic suspension design, the sound stage is also a little more laid back. The high end is the same as the Mission 700S.

The Mission 700S is a few db's louder and much more mid range forward, the bass not being as tight. The Missions surround you in sound where as the JPW's it is more like the sound is in front of you.

Could I live with one pair more than the other? I think the Mission 700S would win out in sound and the real walnut veneer.

Both are fantastic speakers.

JPW AP1 Speakers

On loan from a friend while he is on holidays is a pair of JPW AP1 speakers. These speakers were rated as a best buy in Britain during the mid 80's due to their quality components and the low retail price.

From what I read the PW stood for "prison workers" in the fact that these were made by inmates. I don't know how true that story is.

The AP1 is a simple acoustic suspension featuring Seas/Vifa woofers and tweeters, air core inductors and what looks like a 1st order cross on the woofer and a second order cross over on the tweeter, there is a resistor to tame the Vifa D 19TD tweeter.

This pair had been re foamed in the past 5 years.

Pioneer HPM-60

I just picked up a pair of Pioneer's legendary HPM series speakers, the HPM-60.

In the golden days of vintage audio 1975-1979 (I think continued into the late 80's) the war for domination was lead by Pioneer. The king daddy no budget spared receiver of the day was the Pioneer SX-1280 and SX-1980 which competed with the Yamaha CR-3020, Sansui G-3300, Sony STR-V7 and another legend, the Marantz Model 2500. This was in the day of real "watts per channel" as in 200+ watts continuously, not peak power for micro bursts as receivers are marketed today.

It is fair to say that Pioneer and Marantz won the vintage war as today their receivers still command a big premium over their rivals, a true testament to their quality 35 years later. Here is an interesting article on why 30 year old receivers sound better than today's crap. And another interesting shootout between a Pioneer SX-1980, a Sony STR-V6 and a newer Yamaha RX-V1800.

Back to the Pioneer HPM Series speakers, 1n 1975 Pioneer scooped JBL's Vice President of Engineering, Bart Locanthi who developed JBL's most famous loudspeaker the JBL L100 Decade, remember these where the days when no expenses were spared to gain market share.

The Pioneer HPM-100 was a direct competitor to the JBL L100 with hints of the JBL 4311, the HPM-60 was designed to rival the JBL L36, the HPM-40 was targeting JBL's L26 and the HPM-30's was targeting the JBL L16.

Pioneer had to differentiate themselves from JBL so they added the "Super Tweeter" which was probably more of a marketing schtick than anything else. The Super Tweeter is a thin film foil over foam with to leads attached, no magnet just a current across the film. They do make noise but their output is very low, I bet the sales pitch was that it works but you just can't hear it.

The Pioneer HPM-60 have been playing for the past 24 hours and I can hear the JBL low end in these speakers, they sound like the JBL L26 in that sense but the mid range is there and the tweeter is not a harsh as the JBL tweeters.

I can understand why the HPM 100 and the HPM 60's still command JBL prices in the vintage market.

Update: I have been running these speakers all weekend and these are awesome monitors, very forward sound. Very much like JBL's.