Very early alloy chassis EL34 amp

Is this amp a lash up? Is it original? You get the point.

Very early alloy chassis EL34 amp

Postby neikeel » Sun Feb 08, 2009 6:19 pm

V. early '67?

http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&rd=1&item=280309827206&ssPageName=STRK:MEWA:IT&ih=018#ht_787wt_688


High price for amp with serious cosmetic issues, nice as a fixer upper with original iron but finding original rear panel????

The board etc looks eminently restorable.

Shame it is not a fixer upper price - but then I imagine that we would all be over it like a rash :lol:
Neil
neikeel
 
Posts: 269
Joined: Wed Jun 25, 2008 11:24 am

Advertisement

Banner ads are available for $25 a month. PM or Email me at Info@wallaceamps.com for more details.

Re: Very early alloy chassis EL34 amp

Postby neikeel » Mon Apr 06, 2009 10:27 am

Well..................

I have this on my workbench right now :wink:

http://www.jtm45-100.com/index.php?option=com_content&view=article&id=50&Itemid=55

I have removed the Sprague 16uF caps (the yellow ones from the mains spot, replaced the diode you see with two separate ones, removed the odd preamp filters with single 32/32 Erie replaced the mf with cc in B+ line and added a new front panel and correct rear panel (wrong serial no but I am sure that we can overlook that 8) ).

The grey RS and the Hunts cap actually measure ok but their history is definitely dodgy (short fire ups after 20 years resting :roll: ) so will not risk it - too late to reform them I imagine.

Just waiting on a set of 8 new 32uf cans for PI/screens and mains and we should be ready to go.

She sounded ok as was, just a bit tired.

Hope owner will be pleased with result
Neil
neikeel
 
Posts: 269
Joined: Wed Jun 25, 2008 11:24 am

Re: Very early alloy chassis EL34 amp

Postby Brian Wallace » Wed Apr 08, 2009 9:43 pm

Pretty cool Neil. What type of filter caps are you getting?
Remember....You can fix it with a little extra energy and a positive attitude. ;)
User avatar
Brian Wallace
Site Admin
 
Posts: 1089
Joined: Fri Jun 06, 2008 7:34 pm
Location: Livonia, Michigan

Re: Very early alloy chassis EL34 amp

Postby neikeel » Thu Apr 09, 2009 5:31 am

I was hanging on for some Sozo 32 axials but I cannot see sign of them yet, only the 100 radials

I have gone for some US made TechCap ones. I used some 100uF ones in another 12 series amp and they were pretty good. I do not know if they are another make rebranded?

Will set it up as standard.
Neil
neikeel
 
Posts: 269
Joined: Wed Jun 25, 2008 11:24 am

Re: Very early alloy chassis EL34 amp

Postby David B » Thu Apr 09, 2009 11:13 pm

Neil,

Have you tried the Sozo 100uf ? curious how those are and it would be nice to have some 32uf and 32/16uf cans as well one day.... btw nice amp :D
User avatar
David B
 
Posts: 798
Joined: Fri Jun 06, 2008 9:31 pm
Location: Rockville CT

Re: Very early alloy chassis EL34 amp

Postby neikeel » Fri Apr 24, 2009 1:06 pm

David B wrote:Neil,

Have you tried the Sozo 100uf ? curious how those are and it would be nice to have some 32uf and 32/16uf cans as well one day.... btw nice amp :D


No not yet. 100uF radials are not much use to me usually. I think dual 50s, dual 32s, 100 and 32 axials would all be good, like everyone else I am waiting to see 8)
Neil
neikeel
 
Posts: 269
Joined: Wed Jun 25, 2008 11:24 am

Re: Very early alloy chassis EL34 amp

Postby dai h. » Fri Apr 24, 2009 5:12 pm

I thought ARS had a 16-32 (if memory serves). (But might not be avail. directly--perhaps had to be a dealer to buy from them??)
dai h.
 
Posts: 716
Joined: Sat Jun 07, 2008 9:38 pm

Re: Very early alloy chassis EL34 amp

Postby David B » Fri Apr 24, 2009 9:55 pm

Yeah don't know why he didn't go with more common values like the 32uf but hopefully soon they'll be available along with the other values. :D
User avatar
David B
 
Posts: 798
Joined: Fri Jun 06, 2008 9:31 pm
Location: Rockville CT

Re: Very early alloy chassis EL34 amp

Postby David B » Fri Apr 24, 2009 9:58 pm

dai h. wrote:I thought ARS had a 16-32 (if memory serves). (But might not be avail. directly--perhaps had to be a dealer to buy from them??)



Dai,

I remember seeing that but not sure if they still have em, I use to buy of RTF EL34's for $60 a quad in the eighties from those guys..
User avatar
David B
 
Posts: 798
Joined: Fri Jun 06, 2008 9:31 pm
Location: Rockville CT

Re: Very early alloy chassis EL34 amp

Postby Smallbox » Sat Apr 25, 2009 5:25 am

David (and Dai too),
I think I have a pair of ARS branded 34's in my '69 50w Smallbox downstairs.
Will have to check for sure, but if memory serves me correctly they're not RFT's, but Teslas in my amp...
they must be from a rather long time ago...
On the subject of the electr. caps, has anyone tried/had any good experience w/ reformed caps (NOS) from
like-minded dudes out there? Am very curious to hear anyone's experiences??

Thanks =-)
Ray
Smallbox
 
Posts: 50
Joined: Sat Jun 07, 2008 4:22 pm
Location: Marstranland

Re: Very early alloy chassis EL34 amp

Postby dai h. » Sat Apr 25, 2009 7:52 am

ARS seemed to be one out of a number of re-branders(all based in CA??) such as Groove Tubes, TNT(the new tube company), Penta Labs, and maybe some others? I seem to recall some ARS ads in GP.
dai h.
 
Posts: 716
Joined: Sat Jun 07, 2008 9:38 pm

Re: Very early alloy chassis EL34 amp

Postby David B » Sat Apr 25, 2009 10:23 am

Smallbox wrote:David (and Dai too),

On the subject of the electr. caps, has anyone tried/had any good experience w/ reformed caps (NOS) from
like-minded dudes out there? Am very curious to hear anyone's experiences??



Ray,

Probably safer to use new ones to avoid a mess if the cap fails but if you must. :twisted: Yeah I've use the Eico 950B for new caps just to be sure . There is another method radio dudes use and Larry at Metro outlined very well where a 100k resistor is placed in series on the B+ and you measure the voltage drop across that resistor till it gets to 5vdc the they are formed, could take hours of over night depending on the condition of the cap. Amp with bleeders will need those removed temporarily... Sometimes it works and sometimes the cap is toast
User avatar
David B
 
Posts: 798
Joined: Fri Jun 06, 2008 9:31 pm
Location: Rockville CT

Re: Very early alloy chassis EL34 amp

Postby neikeel » Mon Apr 27, 2009 6:51 am

David B wrote: Larry at Metro outlined very well where a 100k resistor is placed in series on the B+ and you measure the voltage drop across that resistor till it gets to 5vdc the they are formed, could take hours of over night depending on the condition of the cap. Amp with bleeders will need those removed temporarily... Sometimes it works and sometimes the cap is toast


I hav eusedthis method. It worked well for NOS LCRs, not so well for a bundle of used Dalys/Eries I had previously pulled form amps (when I pulled old caps as routine- when good quality caps (LCRs etc) were available.
Neil
neikeel
 
Posts: 269
Joined: Wed Jun 25, 2008 11:24 am

Re: Very early alloy chassis EL34 amp

Postby David B » Mon Apr 27, 2009 4:15 pm

Same here, NOS LCR's did OK but old crusty used ones are better off in the trash can. Could re stuff the carcass with modern little caps for an authentic look
User avatar
David B
 
Posts: 798
Joined: Fri Jun 06, 2008 9:31 pm
Location: Rockville CT

Re: Very early alloy chassis EL34 amp

Postby neikeel » Tue Apr 28, 2009 10:59 am

David B wrote:Could re stuff the carcass with modern little caps for an authentic look


Have you tried this?

Apart form being messy I think I might give it a go..........
Neil
neikeel
 
Posts: 269
Joined: Wed Jun 25, 2008 11:24 am

Next

Return to Auctions

Who is online

Users browsing this forum: No registered users and 2 guests