Yes, a Sony STR-5800SD Bluetooth connection needs no soldering. Best path: a Bluetooth receiver with RCA output into the AUX input (250 mV into 100 kOhm per the factory service manual). If AUX is taken, use a Tape loop. Rated 55 W per channel into 8 ohms, both channels driven, from the factory specification table.
Figures on this page were checked September 2026. Every table row carries its source.
Spec snapshot
| Item | Value | Notes | Source |
|---|---|---|---|
| Production year | 1977– | On sale in 1977; part of Sony's Quartz Lock series with the 6800SD and 7800SD | SM, period ads |
| Power output | 55 W/ch @ 8 Ω | Minimum RMS, both channels driven, 20-20,000 Hz | SM |
| Phono input | 2.5 mV / 50 kΩ | S/N 72 dB per the service manual | SM |
| Line inputs | AUX · Tape | 250 mV / 100 kOhm per the service manual | SM |
| FM tuner | 1.7 µV (IHF) | Usable sensitivity 1.7 µV mono; 3.5 µV mono / 45 µV stereo at 50 dB quieting | SM |
Source codes: SM Sony STR-5800/5800SD service manual (archive.org manual_STR5800SD_SM_SONY_EN). Data as of September 2026. Quartz Lock designation is period marketing language.
Where to connect
AUX input
RecommendedThe always-active high-level spare at 250 mV into 100 kOhm per the factory service manual. Any line-level Bluetooth receiver with RCA output sits in cleanly.
Tape monitor loop
Good alternativeThe tape loop through the monitor switch serves the same role documented across every receiver in this archive: feed the play jacks, select tape to listen, and switch the monitor back off for the other sources.
Phono input
Not for line-levelThe phono stage expects a cartridge's 2.5 mV. A line-level Bluetooth receiver would overload it, and the turntable would lose its input.
Set up in three steps
- Pick AUX
Keep the tape loop free for a recorder; AUX is the natural Bluetooth home.
- Connect and power
Bluetooth receiver RCA out to AUX, USB power attached, pair once with your phone.
- Level check
Volume low, select AUX, then raise. Fixed/line output on the adapter if it offers the option.
Quirks and notes
- Both encyclopedias, zero entries (verified): hifi-wiki and classicreceivers carry no 5800SD data between them, but the factory service manual is publicly archived on archive.org and supplies the full specification table, so this page documents from the factory document rather than from reference-site silence.
- Quartz Lock as marketing: the designation appears in period advertising rather than as a specification line, and this page quotes it as such, with the service manual carrying the actual measured numbers. This framing has not been separately verified against a surviving period advertisement.
What you need
- Bluetooth receiver with RCA output, LDAC or aptX HD preferred
- 0.5–1 m RCA cable
- USB power for the receiver
FAQ
Plug a Bluetooth receiver with RCA output into the AUX input and select AUX. If AUX is occupied, use a Tape input through the tape monitor. No internal modification is needed.
Per the factory service manual: Phono 2.5 mV / 50 kOhm; AUX and Tape inputs at 250 mV / 100 kOhm. The manual is publicly archived on archive.org (identifier manual_STR5800SD_SM_SONY_EN).
The factory service manual rates 55 W per channel into 8 ohms, both channels driven from 20 Hz to 20 kHz.
Quartz Lock refers to Sony's quartz-locked FM tuning system, which stabilises the tuning frequency using a quartz crystal reference. Period advertising promoted it as a headline feature of the series. This page quotes the designation as marketing language rather than as a specification claim.
blafili B3 Bluetooth Music Receiver
RCA + XLR + optical out, LDAC and aptX HD, OLED status display. Matches the 5800SD line-level inputs without adapters.
- Factory service manual figures (55+55 W at 8 ohms, both channels driven, 20-20,000 Hz; Phono 2.5 mV / 50 kOhm / 72 dB S/N; Aux and Tape 250 mV / 100 kOhm / 90 dB S/N; FM usable sensitivity 1.7 µV mono, 3.5 µV mono / 45 µV stereo at 50 dB quieting): Sony STR-5800/5800SD service manual (archive.org, identifier manual_STR5800SD_SM_SONY_EN), accessed 2026-09-25
- Quartz Lock designation: period advertising via search results referencing Sony 1977-78 "Quartz-Locked Audio" campaigns; noted as marketing language without further specification claims