flapland
28-07-2016, 13:20
As part of my clear out/holiday fund I am now selling my Push Pull 300b Interstage power amp based on a World Audio Design first published in the 90's. This amp was built orginally by John Caswell so I understand with a slightly different front end and rectification to the original design. Since I purchased it in 2014 David ( Juancho) has upgraded the amp in two stages. The first was to add battery bias and the second was to put the original design input stage back but with choke power supply as well. He also connected the 4 and 8 ohm taps to the separate binding posts as previously they were both on the 8 ohm tap. I will try to get more details later.
The amp comes with full set of valves and a full set of spares as well. The 300b's are PSVane Hifi and the 300b's Billingtons do cheap on Ebay.
Looking for £950 collected from North London(seriously heavy) although can deliver within around 50 miles if needed. Far too heavy to post and don't have box suitable anyway. The price is what I paid for it before the upgrades and includes the spare valves.*
Some photos with and without valves installed.*
https://c1.staticflickr.com/9/8889/27989985464_324ae6fc8b_k.jpg (https://flic.kr/p/JDnZwh)300b PP (https://flic.kr/p/JDnZwh) by flapland (https://www.flickr.com/photos/36547181@N03/)
https://c1.staticflickr.com/9/8106/27989986544_861a28efda_k.jpg (https://flic.kr/p/JDnZQU)300b PP (https://flic.kr/p/JDnZQU) by flapland (https://www.flickr.com/photos/36547181@N03/)
https://c1.staticflickr.com/9/8233/28500343232_67d691bff0_k.jpg (https://flic.kr/p/KqtH79)300b PP (https://flic.kr/p/KqtH79) by flapland (https://www.flickr.com/photos/36547181@N03/)
https://c5.staticflickr.com/9/8420/27989990724_cd0db245b3_k.jpg (https://flic.kr/p/JDo25Y)300b PP (https://flic.kr/p/JDo25Y) by flapland (https://www.flickr.com/photos/36547181@N03/)
The amp comes with full set of valves and a full set of spares as well. The 300b's are PSVane Hifi and the 300b's Billingtons do cheap on Ebay.
Looking for £950 collected from North London(seriously heavy) although can deliver within around 50 miles if needed. Far too heavy to post and don't have box suitable anyway. The price is what I paid for it before the upgrades and includes the spare valves.*
Some photos with and without valves installed.*
https://c1.staticflickr.com/9/8889/27989985464_324ae6fc8b_k.jpg (https://flic.kr/p/JDnZwh)300b PP (https://flic.kr/p/JDnZwh) by flapland (https://www.flickr.com/photos/36547181@N03/)
https://c1.staticflickr.com/9/8106/27989986544_861a28efda_k.jpg (https://flic.kr/p/JDnZQU)300b PP (https://flic.kr/p/JDnZQU) by flapland (https://www.flickr.com/photos/36547181@N03/)
https://c1.staticflickr.com/9/8233/28500343232_67d691bff0_k.jpg (https://flic.kr/p/KqtH79)300b PP (https://flic.kr/p/KqtH79) by flapland (https://www.flickr.com/photos/36547181@N03/)
https://c5.staticflickr.com/9/8420/27989990724_cd0db245b3_k.jpg (https://flic.kr/p/JDo25Y)300b PP (https://flic.kr/p/JDo25Y) by flapland (https://www.flickr.com/photos/36547181@N03/)