JBL tube amp?

[Hoerninger]

this amp is a MONOblock.

What else with two trannies and four EL34?
Old dchool - I own a similar amp Philips ELEL6432 with Ua = 685V.
Pictures: http://www.ebay.de/itm/251953526457?...663&rmvSB=true
or
http://www.ebay.de/itm/Roehrenversta...p2047675.l2557

The similar Siemens 6SELA2805 (former Klangfilm) uses 715 Volt.
Both about 120 Watt - from the Fifties/ last century!
____________
Peter

[pyonc]

What else with two trannies and four EL34?
Old dchool - I own a similar amp Philips ELEL6432 with Ua = 685V.
Pictures: http://www.ebay.de/itm/251953526457?...663&rmvSB=true
The similar Siemens 6SELA2805 (former Klangfilm) uses 715 Volt.
Both about 120 Watt - from the Fifties/ last century!
____________
Peter

Is this a monaural amp, like this 5120?

[Hoerninger]

Is this a monaural amp, like this 5120?

Yes these are monaural amps,
they are heavy.
I presume they are based on a genuin Philips design introduced with the The EL34 in 1949 by Philips the parent company of Mullard.

Service manual for EL6431 (with enclosure) with 120 Watts and Ua = 660 – 720 Volts:
https://frank.pocnet.net/instruments...431/EL6431.pdf
____________
Peter

[grumpy]

One power transformer, one audio transformer, one audio input... that's normally how it works

have to be careful with the bias at those high-ish voltages... will often see blue halos (normal when run this way).