07-08-2015, 09:22 AM
Well I got this running yesterday, and it sounds OK. Two things though.
It is a complicated thing to tune. Once the Neutrodyne capacitors have been set correctly they are fine until you change the valves or the coils. Once they are set though 3 stages of tuning means a lot of trial and error, although I guess once you have been through that stage a user would have experience and just know where to find stations. We found 5 stations on mw that came in OK.
Getting the HT supply right was trial and error. 88v on the output valve and 44v on the 2 rf stages and the detector otherwise loads of howling and other awful noises.
I used two Mullard PM1HF’s for the HF stages, a Cossor 210HL for the detector and a Mullard PM1LF for the output stage.
All in all it sounds and looks great but I think Mrs Unreal thinks it is a bit big for the front room
. It is impressive looking but takes up a lot of room and these things sometimes get broken up for the parts – they sell on ebay for £££’s but I think it will go nicely on a top shelf in the gym 
I tried to get a short video of it playing but my upgraded PC will not connect to my phone anymore. I am looking at it
It is a complicated thing to tune. Once the Neutrodyne capacitors have been set correctly they are fine until you change the valves or the coils. Once they are set though 3 stages of tuning means a lot of trial and error, although I guess once you have been through that stage a user would have experience and just know where to find stations. We found 5 stations on mw that came in OK.
Getting the HT supply right was trial and error. 88v on the output valve and 44v on the 2 rf stages and the detector otherwise loads of howling and other awful noises.
I used two Mullard PM1HF’s for the HF stages, a Cossor 210HL for the detector and a Mullard PM1LF for the output stage.
All in all it sounds and looks great but I think Mrs Unreal thinks it is a bit big for the front room
. It is impressive looking but takes up a lot of room and these things sometimes get broken up for the parts – they sell on ebay for £££’s but I think it will go nicely on a top shelf in the gym I tried to get a short video of it playing but my upgraded PC will not connect to my phone anymore. I am looking at it
