Bottlehead Forum
Bottlehead Kits => Legacy Kit Products => Stereomour => Topic started by: Alonzo on July 02, 2016, 04:44:57 PM
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What to do, what to do?? I have a ton of parts leftover from the 3+ Stereomours I have and have upgraded. So put in an order to Mike L for some outputs and TA DA! 45 headphone amp with speaker outputs! CLCRC (100uf/10H/100uf/360R/2.2uf) with BCP-15's and TL-404XL's.
Just a prototype for now, it's not much to look at and has some hum that is bothersome between songs. Sounds great thru speakers though. So, up next is to get a BOM for a cleaner version on a 12 x 12, maybe change input to a 10K:10K transformer and a P&G pot, DC heaters if I can't get the noise floor lower.
Pic's of the beat-up top plate and the backwards wiring attached for laughs.
Alonzo
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Your wasting your time, better to part it out and sell me those 404's cheap :P
If you have filament voltage to burn i highly recommend you try Rod Colemans regulators, i have a 6A3/6B4G/6C4C amp mocked up using them as its perfectly quiet for headphone use. I also have a couple of 245 tubes i am planning to try next so it may become a 45 rig in the end :)
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The more I listen the more I love the 404's. I have a pair in my Mainline amp, thinking about getting a pair to replace the EXO-145's in my main 45 amp. So far they seem the top in my available outputs (404's then BH-5 Nickel's then EXO-45 tied with OT-2's). If only Mike made them in Nickel or Cobalt.
I'll give the regulators a look, ordered the BH DC kit to see if it can be adapted, I have a couple 5v filaments unused to play with.
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Just had a quick read of the Coleman reg manual, for a 45 tube he recommends a DC supply of 6.9-8.5 volts, 7.5volts being ideal. If you rectify a 5v winding you should be good... http://lyrima.co.uk/dhtreg/dhtRegIntro.html (http://lyrima.co.uk/dhtreg/dhtRegIntro.html)
Which kit did you order, i noticed the Kaiju kit has regulators where the Stereomour does not.
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I got the Stereomour II DC filament supply. It doesn't work on the Stereomour I normally but I couldn't source a power transformer so I ended up with a Hammond that is loafing in this circuit.
But I don't know, it's sounding pretty good now, I put a pair of 10uf 250v Dayton caps across the filaments. Less hum and buzz, I'll have to judge when the kit come in if it's worth changing.