EXPIRED 300B SET Mono Blocks

[Ihearmusic]

Further information:

 

 

Specifications

Description: Class A single ended triode amplifier in mono block configuration.

Power output at onset of clipping: 10W per channel

Total Harmonic Distortion at 1khz/1W: 0.20%

Frequency response: 26Hz to 68kHz, -3dB (47Hz to 38kHz, -1dB)

Input impedance: 200K Ohm

Input sensitivity: 2.2Vrms to full output

Output impedance: 8 Ohm and 16 Ohm

Weight: 16 kg each

Height: 270mm

Width: 255mm

Depth: 325mm

Power Consumption: 90 Watt per channel

Voltage: 240V 50/60HZ

Finish: Mirror finish stainless steel top, bottom and rear panel; Australian Jarrah wood enclosure

Warranty: 2 Years (90 days on Tubes)

 
Photos:

 

 

PLEASE READ

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ELECTRICAL DISCLAIMER
This product has not been manufactured by a qualified individual or company, therefore contains electrical circuits that do not necessarily comply with Australian Standards. I understand that as the seller, I may be liable to repercussions in the event of equipment failure. By advertising and selling this product, as the seller I also agree that I am solely liable, and the publisher of this website takes no responsibility for any injury or death resulting from, whether directly or indirectly, any accident that may happen as a result of the failure of the product being sold. If in doubt, seek the services of a qualified electrician to inspect the product to ensure it is safe for use.

[denimhunter]

Any further info? such as the circuit, designer, builder of the amp, make and model of  transformers, parts etc. Might be helpful.

cheers

[Ihearmusic]

2 hours ago, denimhunter said:

Any further info? such as the circuit, designer, builder of the amp, make and model of  transformers, parts etc. Might be helpful.

cheers

300B SET TT features.

Design: Undergroundsound Audio (me)

It utilizes the Russian 6C45 valve to drive the 300B tube.

Totally independent power supplies for the driver valve and the power valve.

A third party DC filament supply for the 300B valve.

DC heater supply for the 6C45 valve

Fixed bias for the 300B valve adjustable via a trim pot at the rear panel. ( So much for "Fixed Bias" )

8 Ohm and 16 Ohm speaker out (16 Ohm can be substituted for 4 Ohm on request)

All the iron is by Hammond. (per mono-block) 1x output transformer, 2x power transformers, 1x choke for the 300B valve power supply and 2x choke for the 6C45 valve power supply.

Tube compliment: Gold Lion 300B valve, 6C45 valve by Sovtek.

 

[Monkeyboi]

23 hours ago, Ihearmusic said:

 

 

 

Question about the item has been withdrawn at the request of the seller.

I was asking on behalf of a friend who isn't a SNA member but is interested in buying a 300B based amplifier.

Edited September 12, 2022 by Monkeyboi
withdrawn question

[Ihearmusic]

2 hours ago, Monkeyboi said:

 

Looks very neat and pretty but I have to ask.  Why is there a 5 watt wirewound resistor cable tied to an electrolytic capacitor?

Thanks for your comment.

 

Two point I am making.

 

First and foremost you should follow the Classified guidelines when commenting on items for sale.

 

Here is a reminder in case you never read the guidelines:

 

"Members posting nuisance replies (criticism of products or pricing either up or down, off topic discussions etc) will have their offending posts being deleted, and possible warnings/suspension. You may not make any post which may potentially undermine the sale, including questioning the price being too cheap or too expensive, starting rumours about the provenance of the unit, adding negative comments to an advertisement in order to prevent it being sold or to create doubt as to the sellers intentions or actions. If you have concerns, report the post to Volunteers, or take it up directly with the seller via the Private Message system."

 

Second:

 

In case you have not noticed, this photo was taken during the build and test phase and is not representing the finished article. The resistor you are referring to is now an aluminium housed metal case resistor fixed to a heat sink.

 

Cheers

 

Stephan