Specifications

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Tweed 5E3 PCB Valve Junior Conversion
Build Manual v3.0 13 Feb 2011
17 of 40
You want to drill the Noval (9-pin) holes
VRWKDWWKHVRFNHWµOLS¶UHVWVDJDLQVWWKH
chassis. The Octal (8-pin) socket holes
need to allow the socket to slip all the way
through.
Deburr or countersink each hole to
ensure no sharp edges will cause injury
or component failure. I use a Dremel with
a grinding stone bit.
Notice that the existing VJr EL84 power
tube hole needs to be enlarged to cater
for the Octal socket.
7KHVHFRQG2FWDOVRFNHWKROHLVQ¶WVKRZQ
KHUH,W¶VVWDUWHGIURPIUHVK
Make sure that the Octal sockets can fit
through the hole. The Noval socket
wants to rest up against the chassis, but
WKH2FWDOLVµWKLFNHU¶QHHGVWRDFWXDOO\
pass through for everything to fit nicely.
:KHQGRLQJDVFUDWFKEXLOGERWK1RYDO¶V
will fit snug against the chassis. When
doing a VJr conversion, the second is
JRLQJWREHµIUHH¶DVWKHSUH-drilled hole is
quite wide.
Whilst the 5E3 PCB uses the stock stand-
RIIVWKHFLUFOHGRQHVWLOOQHHGVWREHUHPRYHG,W¶VWRRFORVHWRWKHKROHIRUWKH
first noval socket. DRQ¶WZRUU\WKRXJK:HDGGWZRPRUHVWDQG-offs to more than
make up for it.