Recent content by HDJR808

First, congrats on a successful coil transplant. Those doped woofers are critical to the way these speakers perform. I don’t believe the tweeters had any cooling technology, just a straightforward high quality dome tweeter. Are the mid/tweeter level pots set flat? Best to live with them that...

Despite the fact that Infinity did spec the 902-1187 as the replacement for the original woofers, I can attest from personal experience that the 902-1187 is not an appropriate substitute. They completely alter the tonal balance of these speakers, resulting in nothing close to their original...

You may want to beef up the wattage on the DBT; my recollection is that these amps are uncooperative with anything under 250W.

Just to help corroborate, these 1/2W resistors are 560Ω, as seen here: Apologies for the lousy enlargement. As seems to often be the case with errors in Sansui service manuals, the component listings for the individual boards will be the data that is incorrect, while the schematic itself...

Where are you located?

I see the LS50 is rated to 47hz, so I would think they can support a full range input and probably their response dip toward the low end would help smooth over the bridge between them and the sub.

Not knowing the specifics on the 919, but if the connected/separated switch setup is similar to the 717, it seems the logical thing would be to tap out of the "pre-out" to provide a signal to drive the subwoofer, while the 919 operates as normal to drive the main "small" speakers. The 919 pre...

Two things that I’ve had luck with: a) a 250 watt photoflood for the DBT b) this little item to protect your meter(s): Knife switch closed to bypass the meters at power on, then opened after the initial inrush.

The originals are 8 ohm. This is what you want to look for: The woofer in its natural habitat: The shiny material is the "doping," an almost asphalt-like material Infinity applied to the paper cones to tune their response. The amount and appearance of the coating varies.

Correct, the 902-1187 is what Infinity sold as the substitute, but its performance does not match the original woofer that came in the Jr., and the result is quite inferior to the sound of the original speaker. When I get a chance, unless someone else happens to chime in first, I can get the...

This is probably not what you want to hear, but anything other than the original woofer is likely to be a disappointment. While the 902-1187 is purported by Infinity to be a substitute for the original, and is likely the woofer that I sourced from Infinity as replacements for my Jr.'s back in...

I seem to recall from my crossover rebuild on my pair that the bottom panel has a slightly sticky foam sealing tape around its perimeter, and this may be just enough to make it be stubborn to remove. You can see some of the tape in evidence in this photo: You might want to (after removing...

First off, thanks to everyone for suggestions and observations. Well, sort of... This is the first time I've done a restoration on a receiver, but I did do a restoration and alignment on a TU-719 last year, which was an interesting challenge, but turned out quite well. I am lucky in having...

Thanks for the reply, no, not at all any quad use. This actually is the $60 thrift store purchase that has lived in the garage for 8-10 years, and I was finally getting around to giving it some well-deserved attention. I have to say the part of me that suffers from shipwright's disease will...

I've recently started to dig into the restoration on a 6001, and have run across an interesting puzzle with one of the boards. First off, it is very well built, but there is quite a plate of spaghetti holding this thing together, and with all of the soldered connections being on unmarked solder...