UntilThen
Headphoneus Supremus
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- Jun 16, 2015
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I'm in Sydney, Australia.
There's currently bulk 339 orders being created along with some custom amps (including mine ).
Can you provide details and specifics of your custom LF339 and an indication of price would be good.
Ahhh,this is where youve disappeared to
Can you provide details and specifics of your custom LF339 and an indication of price would be good.
They're making the final arrangements for the adapters, does anyone want to change or back out?
Mizicke5273 (EF86, EF80 - two pairs each, USA)
maximus69 (EF86, EF80 - one pair each, USA)
Josh76 (EF86, EF80 - one pair each, USA)
elNan (EF86, EF80 - one pair each, USA)
danniveng (EF86, EF80 - one pair each, Denmark)
flac4me (EF86, EF80 - one pair each, USA)
UntilThen (EF86 - one pair, Australia)
Price estimation was previously posted, please refer to that.
They're making the final arrangements for the adapters, does anyone want to change or back out?
Mizicke5273 (EF86, EF80 - two pairs each, USA)
maximus69 (EF86, EF80 - one pair each, USA)
Josh76 (EF86, EF80 - one pair each, USA)
elNan (EF86, EF80 - one pair each, USA)
danniveng (EF86, EF80 - one pair each, Denmark)
flac4me (EF86, EF80 - one pair each, USA)
UntilThen (EF86 - one pair, Australia)
Price estimation was previously posted, please refer to that.
I'm goodThey're making the final arrangements for the adapters, does anyone want to change or back out?
Mizicke5273 (EF86, EF80 - two pairs each, USA)
maximus69 (EF86, EF80 - one pair each, USA)
Josh76 (EF86, EF80 - one pair each, USA)
elNan (EF86, EF80 - one pair each, USA)
danniveng (EF86, EF80 - one pair each, Denmark)
flac4me (EF86, EF80 - one pair each, USA)
UntilThen (EF86 - one pair, Australia)
Price estimation was previously posted, please refer to that.
I had to source all of the parts myself as yuking won't do this for you as far as I know. I think the parts in total were around $400-$450 and that includes all of the capacitors (output coupling, power filter), hookup wire, signal interconnect wire, some resistors. You could go deeper and spend a lot more but to me it's not worth it. There is some risk involved in shipping this amp safely from China.
Once the build is complete, I'll post a complete list of parts that I used in case someone wants to repeat the process (some resistors I had wrong). The large film caps (in white) were the most expensive and most challenging because they replace electrolytic capacitors that are under the center square cover. You need very large capacitors in order to get enough uF and size becomes an issue. In fact, what I sent is slightly too large and it's going to require some chassis modification in order for it to work.
The amp is going to be a 6C5/6J5/L63 version and you can roll some different tubes with adapters:
6SN7 --> 6J5 (L/R pair that uses only a single 6SN7 triode, switchable so you don't burn out half of a 6SN7)
Loktal 6J5 which I believe is 7A4
76 --> 6J5
Wow!Thought I'd post an update on the custom amp. Both the film and electrolytic capacitors I selected created size/space issues. Unfortunately, I didn't have a 339 on hand for measurements when I purchased the parts.
The diameter of the 6 top electrolytic capacitors was pretty large and so a non-standard bracket had to be created and other components shifted around.
One of the two film capacitors that needs to go under the center cover.
A larger cover had to be created to accommodate both of them.
Not a straight forward custom build but they seem up for the challenge and are good at solving these problems My original intent was to select parts/wiring that had a similar color but the availability of parts that meet the specifications can be difficult.