Fisher CA-40
- Thread starter Hecubus
- Start date
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CA-40s are tough to find in pairs. The rear-lit tone control graphic on the fascia is way cool. These are hot running amps when the cage is on. The opt tranny is very wide bandwidth, very HiFi.
Circuitry is actually unique, but the phono stage uses the proven classic, active feedback phono EQ and includes some needed pre-RIAA playback curves for early mono discs. Usable tone controls and filters come in handily too. The four EL84s or 7189 types are mounted closely and close to the two rectifier tubes, causing the tube cage to get very hot...
I have had 1 1/2 units for decades and still check the good one every now and then....Surprisingly good sound !
Circuitry is actually unique, but the phono stage uses the proven classic, active feedback phono EQ and includes some needed pre-RIAA playback curves for early mono discs. Usable tone controls and filters come in handily too. The four EL84s or 7189 types are mounted closely and close to the two rectifier tubes, causing the tube cage to get very hot...
I have had 1 1/2 units for decades and still check the good one every now and then....Surprisingly good sound !
Hecubus
Active Member
Excellent to hear. I wish I could DIY something cool like the tone control graphic but that is way beyond me. The only reference I see to frequency response is in a sellers add that states a frequency response of 10-90k HZ withing 1/2 db. I don't know where he got that info but if it is true then they really are remarkable OPT's.
John_Roger
New Member
I don't imagine you would be willing to part with any knobs, huh?
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John_Roger
New Member
I'm also Michigan. Must have been out of my search radius. I get notifications for Fisher.
