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Akai X-150D

Three Speed Inline 4-Track Reel to Reel Tape Recorder

Akai X-150D

Description

The cross-field head created a sensation in the tape recorder market by making possible a wide range recording never before heard on any conventional tape recorder.

Using this cross-field head, Akai model X-150D provides a surprising recording performance of 30-23,000 cps at a tape speed of 7-1/2 ips, 30-18,000 cps at 3-3/4 ips and 30 to 9,000 cps at 1-7/8 ips.

What is superior about cross-field recording? How does it differ from typical recording methods as far as construction is concerned?

In the typical recording system, the signal current and the bias current are combined together and applied to the recording head. It is well known that the purpose of bias current is to record, at high sensitivity, a signal applied on the tape, with little distortion and minimizing noise generation. However, the bias current providing such an advantage also has an undesirable character. That is, the wide magnetic field of the bias current affects the recorded signal, resulting in weakening or even erasing the signal. This phenomenon is particularly noticeable at high frequencies.

In the cross-field system, the signal current is applied to the recording head while the bias current is applied to the bias head. These two heads are located in different positions, as determined inter-relatively, so that the magnetic field of the bias will not affect the signal recorded on the tape, even when sufficient bias is applied. This allows the recorded signal to remain on the tape with high fidelity.

Specifications

Track system: 4-track, 2-channel, stereo/monaural system

Heads: 1 x record/playback, 1 x erase, 1 x bias

Motor: 2 speed hysteresis synchronous

Equalization: NAB

Tape speeds: 1 78  3 34  7 12 ips

Wow and flutter: 0.12% (7 12 ips)

Frequency response: 30Hz to 23kHz (7 12 ips)

Signal to Noise Ratio: 50dB

Input: 60mV (line), 0.5mV (DIN)

Output: 1.23V (line)

Semiconductors: 11 x silicon transistors, 2 x diodes, 2 x rectifiers

Dimensions: 340 x 340 x 230mm

Weight: 14kg

Note: optional 15ips

Downloads

service manual (en)

instruction/owners manual (en) - danickd

If you have any problems opening files please read the download FAQ. All files are provided under strict licence and reproduction without prior permission or for financial gain is strictly prohibited.

If you have additional documentation please consider donating a copy to our free archive.

Akai Reel to Reels

Comments

re: X-150D

I have no power. Need a schematic on the pwr supply.

re: X-150D

Thanks for the manuals, but I have a problem with the "Play". The machine rewinds and fast forwards, but won't "Play". Don't really want to take it apart unless there really is a solution by doing so.

very good

thank you very much i love this site very much

Thank you!

I will be sending you some manual in return real soon! Thank you so much and God bless!

Need Schematic for Akai X150D

I downloaded the Service Manual, but the schematic was not included in the download. Does anyone have a schematic? The problem I have is that the left record isn't working well. The recorded material jumps around every second or so (randomly) from normal to extremely weak during playback. The right side is fine. Pre-recorded tapes playback fine. Any suggestions?
Thanks

Channel issue in Akai X150D

This machine uses a slide switch to go from record mode to play mode. Take the machine out of its cabinet, from the bottom remove the two small amp modules. This will give you access to one end of the slide switch on the remaining board. You'll know where the switch is by the two rows of solder joints on the bottom of the board. Spray some DeOxit D5 into the switch and work it back and forth to distribute the cleaned through the switch.

schematic for X150D

I have a schematic but the file is more than 8MB.
How i can send it ?

Fabrizio i4YFC

re: schematic for X150D

HI,

Can you send me the schematic? I would greatly appreciate it.

Robert

Akai X150D L-ch dropout;

ellsworth audio company's picture

juneyg; Hold your finger lightly on the supply reel while recording for a while, if the problem goes away or gets much better, you have poor tape to head contact. That problem can exist due to worn heads or weak reverse tension on the supply reel. On that model and all of those older Akai's with that transport the problem is more likely the supply reel. The felt pads that act as a clutch is to compressed or disintegrated. The factory recomended repair was to replace the entire reel table as one piece. Unfortunately the have not been available for many years. You can try to disassemble the table and clutch and try to replace the felt but good luck with that. Dennis

 

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