The Amp Garage

just finished the ray clone and it sounds stupidly good!! iv got a nos "mini watt" made in britan in there, seems to stay clean right up untill its way too loud

im still waiting on some parts to arrive so i dont know how it sounds yet but it'l be going by the end of the week! as for the the ef86 thing i think iv been very lucky with those so far because iv never really had microphonic problems , i giged with a dc30 clone for nearly two years and never had a...

all good mate, i accidentally posted it twice and the other one got all the replies. iv since turned it into a stangray clone anyway
thanks for your concern tho cheers!

thanks so much for the help everyone! i can gig with my rocket again now!

I remember trying that switched option for 260V / 300V on a Rocket with the Heyboer (230V here). I also tried the so called "half power switch", but all those extra switches kind of runs against the minimalist approach of the Rocket. As I did not care for either the 300V, or the half power, I stuck...

ok here are my new voltages @ 260V b+1 = 288 b+2 = 279 cathode V = 8.9 power tubes; 1. pin2 = 13mv, pin 7= 279v, pin 9=272v, 2. pin2 = 13mv, pin 7= 279v, pin 9=272v, 3. pin2 = 13mv, pin 7= 281v, pin 9=272v, 4. pin2 = 13mv, pin 7= 281v, pin 9=272v, pin 2 is only an approximation because it seems to f...

yea i used to have that switch but i got rid of it and wired it straight to 300 when i put the heyboer tranny in. im in Australia so we have 240 mains but i think the 290/260 switch is supposed to be like the comfort/speed on the new z wreck.

awesom, thank you so much martin you'r a legend mate!

perhaps i should switch to the 260V tap on my pt rather then the 300V tap then?

and does this mean those power tubes are probably fried by now?

oh and yea all the tubes were in when i took those measurements. maybe i did something wrong ill double check tomorrow. my screen resistors are 1k not 100r. thats the stock value for the ceriatone clones

wow... im in way over my head now! yea they were brand new when i put them in, thought id give a set of new production mullards a go

b+1 = 330
b+2 = 320
cathode V = 10.3

power tubes;

1. pin2 = 20mv, pin 7=320v, pin 9=311,

2. pin2 = 20mv, pin 7=320v, pin 9=312,

3. pin2 = 18mv, pin 7=322v, pin 9=311,

4. pin2 = 18mv, pin 7=322v, pin 9=311,

i worked out the average screen current to be .068

does that mean my average plate dissipation is 5.9?

ok my screen voltage (pin 9?) is 320 and the plate voltage (pin 7?) is 332. iv never had to trouble shoot this far before and im really appreciating all your help

ok might be onto something here, i have previously swapped all the tubes out but i pulled a used set of el84's from another amp NOT a new pair.. duh. i just measured my cathode current and if i did it right then it looks like my bias is way hot at 50 ma cathode resistor has 10v across it 10/50= .2 ....