Sunday, November 20, 2016

NATO'ed Vostoks

Vostok Amphibia, Model 420 

Lug width = 18mm

Vostok Amphibia, Model 110

Lug width = 22mm

Monday, October 24, 2016

November Hi-Fi Show 2016

The one and only Hi-Fi event in the Philippines, a must-see for enthusiasts in Manila!

Sneak peek of what you'll see and hear in room 447 (Harana/Setup/Tono)

Sunday, October 23, 2016

Stuff I regret flippin'... the early days because I was an idiot ;( 

In the summer of '86, I acquired my first Thorens TD124 equipped with the above tonearm at an estate auction for $1!!! I kept and used the turntable but the plastic cover of the counterweight was cracked so I replaced it with a Sumiko MMT. I eventually sold this tonearm for $10. I didn't know what an Ortofon SMG212 was then.

I purchased a box lot of tubes and parts for $5 at a hamfest which contained one of these. Later that day, I accepted a $15 offer for the transformer. I've been looking for another one since...

Found one at a flea market for two bucks and flipped it at a hamfest for $20. I didn't know it was an Altec 3000B, the phenolic horn looked too cheesy. 

Sunday, September 18, 2016

je2a3 amp

Twenty three years ago, I built my first 2A3 amp in the basement of the very same house I'm staying in right now. This was a pair of PP2A3 amps with a Mullard-Style driver circuit pumping 8W per channel of pure Class A to drive 82dB/1W/1M (in)efficient BBC LS3/5As, with external preamplification.

As I enter another phase in life, I am back in the same house, mellower with age but hopefully wiser, building a single channel, single-ended 2A3 amp with 3.5W output to drive a 99dB/1M/1W efficient Altec 2-way horn system, with a phono and line stage on board.

This project started with a chassis and choke (amongst other things) handed over by Joe Roberts at the Capital Audio Fest last July. Additional parts were either donated by my hamfest/radio show buddy, Chong Ong or ordered online, like the Hammond 272X power transformer, which came from Steve at Angela Instruments. Back in the 90s, I could have built this amp (except for the output transformer) using parts sourced from hamfests and radio shows. But times have changed, sadly for this project, the only parts I got from a hamfest were the tube sockets ;(

I had been exchanging emails with J-Rob regarding the WE/Altec 32, Emilar horns/drivers, ROK idler TTs, viscous damped tonearms, vintage cartridges like GE RPX, Shure M3D, etc. Among the tubes he suggested I try in lieu of my favorite octal 6SL/SN7s and 5-pin 27/37 and 56/76s, which are getting quite expensive, are the Loktal equivalents + the "Mickey Mouse" plate and grid-capped 2C22/7193 med-mu triode.
WARNING: the 2C22 is not for the faint-hearted, there is over 200VDC in the plate cap if accidentally disconnected while the amp is operating!!!

As depicted in the above block diagram, this is classic (nothing new = boring) JE Labs ;) I used 2 x 7B6 loktals in the RCA derived RIAA phono stage sans variable EQ. A stereo > mono mixer via a WE111C repeat coil to process digital sources was integrated into the chassis, then a single medium-mu triode 2C22/7193 acts as a line stage preamp cap coupled to a Radiotron SE2A3 amp.

The chassis was painted in Silver Hammerite, but wiring had to wait due to actual music making and more important projects ;)

Fancy-schmanzy boutique parts were not used in this amp - just plain old carbon resistors, paper in oil caps and electrolytics in the tube rectified/choke filtered power supply.

The amp section is currently fitted with a Noguchi PMF-15WS OPT I got in Akihabara. It sounds really good! You just have to take my word for it since I don't have a scope and audio generator to prove it ;)

At a later date I might swap in the PMF-10Ws, but ultimately I'd like to permanently install an American made OPT, maybe an Edcor or ask/beg Mike L. at Magnequest to wind a single TFA204 OPT just to keep the amp an ALL American classic ;)

Time Out

ala  Turk

Sunday, September 4, 2016

Raleigh Twenty

If there were such a thing as a classic folding bike, it'd have to be the Raleigh Twenty, sold from the late 60s until the early 80s. The late Sheldon Brown was very fond of this machine. 

Although it was available in the USA, these are a lot easier to find in their home country, the UK, and its other former colonies like Australia, New Zealand, South Africa and Canada.

Super Cycle Twenty

Fortunately for me, my brother who lived in Toronto patiently scoured Kijiji classifieds and found me this Canadian version - Super Cycle Twenty. He liked it enough that he bought himself the rarer 451 wheeled version.

My all-original Super Cycle Twenty with 406 wheels after assembly, which is in such good condition that only a culture vandal would dare do modifications to it.

Rollei 35 + Tessar 40mm f3.5
Fuji Neopan 400 in BTTB

Sadly, I had to leave these two British classics behind ;(

Restomod Project

I miss the Super Cycle Twenty so when the opportunity came to rescue
 a Raleigh Twenty that had been exposed to harsh elements, it became the perfect candidate for my minimalist, Mini-Velo-inspired R20.

While taking the bike apart, I had to use a hacksaw to remove the rust frozen chain, chain guard, amongst other things that were once attached with a nut or bolt ;(

The steel rims were also suffering the ravages of oxidation. Two weeks of soaking the Sturmey-Archer AW 3-speed hub in WD-40 and it still wouldn't budge. I finally decided it was best to build a new set of wheels and revisit the AW hub at a later date.

My next challenge was dismantling the headset/fork. Somehow the top nylon bushing fused with the stem, fork and headset assembly. While I was playing at the Shippensburg Music Festival, I discovered a local bicycle shop, the owner of which succeeded in taking them apart, as well as a stubborn cotter pin in the crank set. Thanks Terry!

Eventually, I got the frame stripped and prepared for repainting.

Parts for a new wheel set: Sun CR-18 406 36H rims, SRAM Automatix 2-speed coaster brake rear hub,  Sovos alloy front hub with a 5/16" axle, DT Swiss 185mm double-butted spokes + brass nipples

After heeding advice from the nice folks at The Raleigh Twenty forum, I used the Pro Wheel Builder to calculate for spoke length and settled on one spoke length for both front and rear wheels. The front wheel ended up laced in a 2-cross pattern while the rear is a standard 3-cross. 

The frame and fork were painted using 2 cans of Rustoleum black hammerite and left to dry for a week. After cleaning the bottom bracket assembly (cups and axle), it turned out to be in excellent condition. I just repacked the bottom bracket with fresh grease using brand new 1/4" ball bearings. Using a wire brush attachment to an electric drill, the 44T chainwheel and cranks polished up nicely, then I fitted a pair of lighter folding pedals. 

A Ritchey Logic headset replaced the original nylon bushing.

The Origin 8 Classique Sport leather saddle + alloy seat post is significantly lighter than the original Brooks touring saddle with coil springs and its matching steel post. Kenda 20 x 1.75 road tires with new inner tubes were fitted to the rims.

Cork Grips + H2O bottle

Commissioned on Aug. 30, 2016 using the stock 44T chainring + 19T cog supplied by SRAM yielding a low 43.3 and high 58.9 gear inches. As reported in this blog, the SRAM Automatix tends to up shift too early. I haven't done the recommended hack to address this issue but bookmarked it for future reference. Meanwhile, I've learned that modulating pedal pressure prevents shifting too soon, while a slight backpedal or merely coasting can re-engage low gear. I was more concerned with the rather low gear ratios so after almost 50 kilometers of riding, I replaced the 19T with a 16T cog for a longer effective stride of 51.4 and 70 gear inches, respectively.

Looking forward to fun-filled cycling moments on this bike ;)