Conrad-Johnson Design
Conrad-Johnson Design1 week ago
Good times at the Capital Audiofest 2018. Standing room only in the conrad-johnson/deja vu room Saturday.
Conrad-Johnson Design
Conrad-Johnson Design2 weeks ago
Images of the conrad-johnson/deja vu display at CAF. Looking forward to seeing many enthusiasts there. Speakers are Harbeth 40.2, driven by conrad-johnson ART150 amplifier, GATs2 preamplifier, and TEA1s3 phono stage. Source is a Audio Note T1 Deluxe with Audio Note Cartridge.
Conrad-Johnson Design
Conrad-Johnson Design2 weeks ago
Second round prototype of the headphone amplifier has been completed, incorporating a number of revisions. Looking about ready to release production orders. Hope to have photos of fully dressed unit soon.
Conrad-Johnson Design
Conrad-Johnson Design4 weeks ago
Capital Audiofest is coming up in just two weeks (November 2-4). Conrad-Johnson will be there in room 505, partnering with our DC area dealer, Deja Vu Audio. This will be your chance to audition conrad-johnson's flagship level products: the TEA1 Series 3 phono stage, GAT Series 2 line stage, and ART150 amplifier. Jeff Fischel (owner, and senior technician) looks forward to meeting and talking with dedicated audiophiles.
Conrad-Johnson Design
Conrad-Johnson Design2 months ago
A quote from our good friend in Israel, Shemmy Mashiah reporting on his recent acquisition of an ART150 amplifier: “Ever since I got the amp I am spending almost every night listening to music. I discovered again my Sinatra collection.”
Conrad-Johnson Design
Conrad-Johnson Design2 months ago
The question has recently come up of how to connect a conrad-johnson stereo amplifier that has been wired for mono operation. The following instructions are for converting a Classic Sixty from stereo to mono operation - but the procedure is the same for all conrad-johnson tube amplifiers. NOTE that if the amplifier has been factory wired for mono operation, then steps 1 and 3 have already been done at the factory.

The two channels of a Classic Sixty amplifier can be connected in parallel to create a 120 watt
monaural power amplifier. To convert a Classic Sixty to mono operation:
1. Connect the two channel inputs together. This can be done either a) externally with a “Y”
connector, or b) hard wired internally. In the latter case, disconnect the amplifier from A/C
mains. Connect a jumper wire between the center pins of the two input connectors.
2. Connect a short length of speaker wire between the two positive speaker terminals. Again,
this can be done externally, or internally with a wire attached with ring terminals inside the
chassis.
3. The amplifier may need to be configured for a different output load impedance. When the
two channels are connected in parallel, the amplifier’s rated output load impedance is ½ that
of each channel. A factory standard Classic Sixty amplifier is set for a 4 Ohm load, so when
connected for mono operation it will match a 2 Ohm load. To have a mono amp matched to a
4 Ohm impedance (the factory recommended setting) the individual channels must be reconnected
for 8 ohms. See the attached bulletin on setting the output load impedance for a
Classic Sixty.
4. Connections to the mono amplifier can be made to either input connector and to either pair of
output connectors.

news from conrad-johnson

news from
conrad-johnson

new ART amplifiers

new ART amplifiers

In celebration of our 40th anniversary, conrad-johnson has introduced two new ART amplifiers: the ART150 stereo amplifier and ART300 mono-block amplifier.

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announcing new classic amplifiers

announcing new classic amplifiers

The conrad-johnson design team is committed to adapting the advances from our state-of-the-art pursuits to more affordable offerings accessible to a wider range of music lovers.

read more