Recent content by djp150

Sorry that sounds as though he drew them after Doug died -he didn’t -before!

Yes will do -I’ve put them in the loft but will get them out when next up there and send them . I met up with the guy who drew them up for him well after Doug died and he said he would get them out for me and post them . To my surprise he sent on sheets around 30x20 in’s. They are supposed to be...

Yes - very similar -I have 4 black caps for the heater supply . 2 black ones 220uf on HT and I did have one 100uf for the power mosfet which may have been a Glen Croft mod rather than a Doug mod . So glad I have Doug’s circuit diagrams of his Excelsior and Exquisite amps so that Jez could...

Yes it was a bargain back then . I haven’t a clue how much I paid but I would guess around £400-I already had one -I wanted one for a 2nd system I built with a maplin 100w valve amp which had nearly every part upgraded. Was yours with the bigger power supply .

Ha just read this -I probably bought it !

Yes that switch will do nicely . Thanks Took the plunge and connected the preamp -all is working fine . Voyage dropped to 270 as per the circuit diagram . So thanks to Jez for rescuing this from going to the tip . It’s now running as per Doug’s final circuit diagram and all I need now is to...

Thanks for this. I will check the size out and let you know . I became concerned when I read on TNT about the distortion introduced by the existing switch (not on phono due to direct switch ) and I’m sure I’ve heard this on cd .

Whilst I have everything open I was contemplating replacing the cheap looking 2 pole 6way switch for choosing phono cd tuner etc . Has anyone a suggestion on something I can use which would be superior .

Jez -ok so after doing some decorating I’ve found time to change the circuit to include the valve as per the circuit diagram . I haven’t finished connecting some of the wires to the switch , light etc as I wanted to check voltages first . So the heater voltage to the preamp are fine . The Ht out...

Yes I do realise that. I think I understand it now . I must admit I couldn’t understand why the circuit was suggesting those 2 resistors should go to pin 8 HT but you’ve explained it to me and it’s also mentioned on the TNT website on the excelsior page . Anyway nothing to lose as I nearly...

Yes the 2nd set of 6.3 windings are unused which is strange but for some reason on my box it was decided to control the HT by solid state even though the board is the one that conforms to the circuit I posted -strange -I thought at 1st that the 6.3 output was probably not working but it is ...

Ok , I get it now. Takes time when you are in your 70s ! I run the 6.3 output from the transformer directly to the heater of the valve and take a 100ohm resistor from pin4 and pin 5 to pin8 . So my only question is what wattage should the 100 ohm resistors be . Everything else on the board...

The 6.3v output from the transformer that supplies the separately boxed preamp is working fine . As you say I have around 17v prior to the regulator and 12.8 coming out of it and around 6.1v at the heaters on each valve in the pre-amp . I will try to load the other circuit later after the...

Sorry I was going to reply -looked at the time and realised I should have been on the road . So first thank you so much for your time -you don’t know how much I’m grateful . I understand the 2nd part of your answer and when I measured the voltage at the preamp valves there was roughly 6.2 volts...