Heathkit XO-1 Electronic Crossover
Archived listing from the original vintage-amplifier.com. Prices, seller details and purchase links have been removed; this page is a reference record, and nothing here is for sale. About this archive.
Heathkit XO-1 Powered crossover network. This is a mono crossover unit. I have had a bit of fun using this with altec and jbl speakers. I took this unit to my service tech about a week ago for service. It only needed cleaning and testing. He cleaned and tested. no new parts needed. The tubed checked out as strong. They are heath branded mullards all three. They are 12ax7 and 6×4 which has a square getter. Great tubes!
About this model
An electronic crossover splits the audio signal into frequency bands before amplification, so each band can be fed to its own amplifier and driver. The XO-1 does that with tubes: the seller lists three Heath-branded Mullard tubes, 12AX7s and a 6X4 rectifier. It is a mono unit, so a stereo system needs two.
The seller used it with Altec and JBL speakers, a natural pairing, since bi-amplified horn systems are exactly where an electronic crossover makes sense. A technician cleaned and tested it and found no parts needing replacement.
| Maker | Heath Company (Heathkit), USA |
|---|---|
| Model | XO-1 |
| Type | Mono electronic crossover |
| Tubes | 12AX7 and 6X4 rectifier, Heath-branded Mullard (listing) |
Questions collectors ask
What does the Heathkit XO-1 do?
It divides the signal into low and high frequency bands before the power amplifiers, so each band can drive its own amplifier and loudspeaker.
Do I need two XO-1 units for stereo?
Yes. The XO-1 is a mono unit.
Sources: Wikipedia: Heathkit; Wikipedia: 12AX7.
