Thanks for that,the existing tubes are the originals as supplied with the amp.When contacting mastersound they said an engineer had to physicaly look at the valve.Cant understand that. Any way all the specs have been sent to them will wait and see what comes back .Another problem has arisen.Cant Bias the right right valve .Using the bias socket at the rear of the am p I can only get it to read 5.8 Volts max,albeit continuing to turn it turns the valve red (Ugh )immediately turn it down again.Can only gage level through comparing brightness of tubes .Trying to get info our of Mastersound is a nightmare,Trouble is I am working in Abu Dhabi which does not help as there is not a abundance of engineers who can tackle this .Albeit Dubai Audio have kindly offered to look at it.Patience is a virtue.
Mastersound Compact 845 with Pvsane 845T
I own a Mastersound Compact 845 and Mastersound PH5 Pre Amp and orderd two Pvsane 845 T Valves.I was advised by the valve supplier that they would work ok as they were the top of 845 range of valves.I was then advised by my dealer that a mod had to be done to the Cathode Resistor on the Compact 845 to take account of the voltage increase.Otherwise the uit could in the future fail.Any body out there using the 845 T in the compact without modification to the resistor should be aware of this .Any comments welcome