optonica

Hi All, I have an RP-3636 that i just love, It has a nice little Audio-Technica AT-13EX cart and it track and plays extremely well. I love the weight it has, its more resistant to vibration than any other table i have tried. (Stock photo) But alas, my beloved chunk of rock has a mystery hum...

This is a happier thread than I thought I was going to be starting when I woke up this morning. My Optonica SM-3636 that I've owned for about 3 years went into protection mode while idle last week. For several months leading up to that, it had been intermittently emitting very loud bursts of...

Hey Everyone- First Time Post. Been Lurking. So, I got a HH Scott, LK-72 last year, recapped it, almost works good. Decided I would set it back, and go through it further later. Then, I was at an estate sale and picked up a dirty Marantz 2245. Cleaned it, recapped the power board, and it...

Working on this rare beast that has blown both driver boards and i am looking for same hard to find transistor substitutes. 2sb717 2sd757 2sb719 2sd759 Also looking to find some information on the dual 5 pin transistors that are used 2sa995 2sa979 2sc2259 2sc2291 Any help would appreciated

Hello! This is my first post and I'm hoping to get some help troubleshooting my Optonica SA-5206. Both the A and B right channels are out. I think there's a blown fuse and I have some replacements ordered. What I'm curious about is why that fuse might have blown. I've had the receiver for 8...

I've never heard of this brand, but looking at the image, this unit look heavy and pretty darn kool. I'm new in the vintage scene and looking for experts opinion from here. The unit I'm looking at has a cracked cover; so, first question can you get an after market cover for this since OMD is...

Just upgraded(?) from a 1972 Fisher 40 all-in-one unit, to a optonica rp-4705.. I got a Toshiba sa-420 receiver in great shape for $20, So that is what I am currently using. If I need to upgrade from the receiver, I am willing, but I would love some advice on a pair of speakers that would sound...

Hi guys, I've got this fine piece of Sharp Hi-fi; actually it's been stored for a long time. This weekend I thought to service the little beast as it is too nice to just sit in bubble wrap until armageddon. During the service exercise I have: - Replaced the busted rubber tire around the...

Hey all, Usually, I post in the Marantz forum because I play with them mostly, but have begun to appreciate the Optonica from Sharp. I am trying to find either a replacement or substitute for the biasing diodes on an SM 4545. The parts list shows it as a VHVMV203Y/-1, don't know if that is a...

Total noob question here-- I picked up a bunch of vintage Misubishi audio equipment at an estate sale and I'm not quite sure how to connect everything up. The 3 pieces in question are a DA-R25 receiver, a DA-P30 Pre-Amplifier, and a DA-156 Equalizer. Using my slew of RCA cables--what goes...

Hi! I've owned a vertical, linear, both-side play Optonica RP-114H turntable for quite a while now. When I bought it, I was just a beginner, so instead of replacing just the styli, I threw the entire original cartridges (two Audio Technica AT3830s) away and replaced them with Audio Technica AT91...

Hi, I'm hoping someone can point me in a right direction here. My Optonica SA - 2605 developed a distortion in a left channel. I almost cant hear at lower volumes, but starting about 1/3 up the volume dial and higher it becomes pretty obvious. Right channel is clean and clear. It's there with...

Just like many of us here, I like to seek out and try out different items - be that speakers, tape decks and of course - receivers/amps. Of course, there are Big Boys club members - Pioneer, Sansui, Yamaha...And I have a lot of respect for those, but often some smaller brands are being...

I'm having an issue with my speakers. I'm getting this persistent ticking sound, even when my turntable is off. I've tried moving the speakers away from my receiver, but it's still there. It's driving me crazy.

I am talking to two different people about buying a receiver. One has an Optonica 5406. It is partially recapped, STK drivers are new, had an LED upgrade, and all of the pots and switches have been cleaned. It's essentially brand new. He's asking $225. The other is a Marantz MA-600. I know that...

I bought an Optonica RP-7705 some time ago at a thrift store and am anxious, now that I have some money to restore it. But it lacks a counterweight. Would any of you know offhand if the counter weight for an Optonica RP-4705 Direct Drive Automatic Turntable also work for an Optonica RP 7705...

Not that I needed a new receiver, but I just couldnt say no to this one - in almost new shape, looks like was kept in good enviroment, seems to be never opened and works perfectly so far. I didnt have a chance test everything yet, but Phono and tuner work and I already can tell that this things...

Hey all, New member to the forum. I have recently started getting into vintage audio gear in part thanks to you guys. I have been reading and learning about all the different receivers out there. The one thing that I have learned is that good deals are hard to come by these days with vintage...

Hello everyone, I purchased this Optonica SA 5201 on Kijiji last year from a gentlemen's basement in Niagara Falls Canada. I immediately took it to my repair technician and had him give it the once over. He had bad news once his diagnostic was complete. Like I said, it was over a year ago, so...

I just discovered that an amp I gave to my daughter a few years back is actually quite a gem. It is an Optonica SM4646. Optonica was high end to Sharp like Technics was high end to Panasonic. The SM4646, it turns out, was Optonica's top of the line amp for about 1976/77. Optonica brand did not...

Hi Everyone, I just got an Optonica SM 4545 amp from GW that I like really well. I have a couple of questions: 1. Does anyone have a users manual? I have the service manual. 2. I cannot get a signal from either phono outputs. Does this unit require a pre-amp to run the phono or could something...

the last two weeks have been pretty good to me in the turntable world. I've found a really nice Thorens TD-160 mark 1, a Sony PS-X600 (not working...yet!), and an Optonica RP-3500 turntable from Sharp! This beast is massive! It has a stone plinth made from a synthetic granite like material and...

Okay, so I have a ton of Marantz stuff, I love it, but every now and then I stray. This tine it is an Optonica SM 3205 amp. Optonica was Sharp's attempt to compete with the big boys in the 70's. I have a 4646 and it is built like a tank with three power supplies (one for each amp and one for the...

Okay, so I have a ton of Marantz stuff, I love it, but every now and then I stray. This tine it is an Optonica SM 3205 amp. Optonica was Sharp's attempt to compete with the big boys in the 70's. I have a 4646 and it is built like a tank with three power supplies (one for each amp and one for...

Folks..... I have an Optonica RT 6405 Cassette deck which I have owned since 1981.....original owner....recently, it developed a problem where it will reverse, play and FF but, won't record. I cannot find a schematic for this deck anywhere on line......has anyone else encountered this...