Croft Series X info

carlosb
Prospect

Posts: 2

Croft Series X info Jul 17, 2023 13:15:41 GMT Bigman80 and pete like this

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Post by carlosb on Jul 17, 2023 13:15:41 GMT

Hi all.

Two weeks ago I received from a friend a Croft Series X amp.

I can´t find any info on internet about this amp, and want to ask if somebody can tell me something about the schematic, tubes, etc..

I tested it and the volume is very low, I don't know if the tubes are what they should be and if they are in the right place (have 2 12AU7, 2 12AX7). This use 6080 tubes in the power section.

I send it to a tech guy and he tell me exactly "sell that, it is a circuit that demands a lot from the valves, it is very hot and since it does not have transformers at the output, the speakers are at risk".

I see the amp in original condition, very neatly and I would like to investigate well before making a decision. I would rather keep it if everything was fine.

Many thanks

pete Established Member Posts: 819	Croft Series X info Jul 17, 2023 13:31:23 GMT via mobile Quote Select Post Deselect Post Link to Post Member Give Gift Back to Top Post by pete on Jul 17, 2023 13:31:23 GMT You have come to the right place to ask this. Unfortunately I am not the right person 😁but they will be along soon

firebottle
Audio Addict

Posts: 1,702

Croft Series X info Jul 17, 2023 17:41:52 GMT Bigman80 and pete like this

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Post by firebottle on Jul 17, 2023 17:41:52 GMT

Hi Carlos, the series X is an OTL amp (Output Transformer less) with 6080 output tubes.

I have built my own OTL using 6080 tubes, they don't have a lot of output power. My amp will only output 6W into an 8 ohm speaker, or 12W into a 15 ohm speaker.

The 12AX7 tubes go at the input of the amplifier, the 12AU7 will be the driver tubes. Likely has fairly low gain anyway.

Any other questions just ask, Alan

Post by carlosb on Jul 17, 2023 13:15:41 GMT

Post by pete on Jul 17, 2023 13:31:23 GMT

Post by firebottle on Jul 17, 2023 17:41:52 GMT