I'm in the process of building a pair of GEC912+ amplifiers as a 'winter project'. These are EL84 ULPP amplifiers, but the output transformers are tapped for 4 and 16 ohms. No 8 ohm tap!
I'm intending to use them with my JR149 loudspeakers which are reputed to be a 'benign' 8 ohm load, whatever that means! I'm trying to work out whether to use the 4 ohm or 16 ohm taps, as into 8 ohms, the 4 ohm tap gives me less distortion but a lot less power, whilst the 16 ohm tap gives me somewhat more power but at higher distortion. All the specification for the JR149s say is 'suitable for 4-16 ohm outputs!
I've been looking on-line for reviews of the JR149 that include an impedance plot, but haven't been able to find anything. Does anyone here know what the impedance curve of the JR149 look like, so I can attempt to match with the best output tap? I could measure the impedance myself, but that's a faff to do if it's been published somewhere, so hope someone can help.
For those who like these things, here's a photo of the underneaths of the first amp being built.
With thanks
S.
I'm intending to use them with my JR149 loudspeakers which are reputed to be a 'benign' 8 ohm load, whatever that means! I'm trying to work out whether to use the 4 ohm or 16 ohm taps, as into 8 ohms, the 4 ohm tap gives me less distortion but a lot less power, whilst the 16 ohm tap gives me somewhat more power but at higher distortion. All the specification for the JR149s say is 'suitable for 4-16 ohm outputs!
I've been looking on-line for reviews of the JR149 that include an impedance plot, but haven't been able to find anything. Does anyone here know what the impedance curve of the JR149 look like, so I can attempt to match with the best output tap? I could measure the impedance myself, but that's a faff to do if it's been published somewhere, so hope someone can help.
For those who like these things, here's a photo of the underneaths of the first amp being built.
With thanks
S.