📍 Los Angeles County & SoCal
🔧 30+ Years Experience
🎚️ Vintage Marantz Specialist
🏢 TEK Media Group
🇺🇸 WE WORK LOCALLY & NATIONWIDE 🇺🇸
Los Angeles • Southern California • Shipping Available Across the United States
📋 A NOTE FROM MY WORKBENCH: The Marantz Model 2230 is a classic 1970s solid state receiver. It features a discrete transistor amplifier design and a sensitive FM tuner. Capacitors in the power supply, audio path, and FM section degrade with age and need replacement. My email is
jt@tekmg.com for direct inquiries.
⚠️ CRITICAL WARNING – MARANTZ 2230 SPECIFIC: The 2230 uses 2SC458 transistors in the preamp and phono stages – these are known to become noisy with age and MUST be replaced. The power supply filter capacitors also degrade significantly. I provide a thorough, methodical restoration to factory specifications.
About the Marantz Model 2230 & My Approach
The Marantz Model 2230 (produced 1972-1976) is one of the most iconic receivers of the 1970s. With 30 watts per channel, a warm, detailed sound signature, and the classic Marantz aesthetic, it's highly sought after by collectors and enthusiasts. I've restored hundreds of 2230 receivers over three decades, and I treat each one with the meticulous care this classic deserves. I use premium replacement components and follow factory service procedures to ensure your receiver performs to original specifications – or better.
✅ WHY TRUST TEK MEDIA GROUP WITH YOUR MARANTZ 2230:
- 30+ Years of Vintage Marantz Restoration Experience
- Specialized Knowledge of 22xx Series Receivers
- Full Power Supply Rebuild & Capacitor Replacement
- 2SC458 Transistor Replacement (Noise Elimination)
- Precision FM Tuner Alignment
- Amplifier Bias & DC Offset Calibration
- Lamp Replacement with LED or OEM-style bulbs
- Every Receiver Gets My Personal Attention – No Assembly Line
- 90-Day Warranty on All Work
- Nationwide Service – Secure Shipping Across All 50 States
- Direct Email: jt@tekmg.com
Complete Marantz 2230 Restoration Services I Offer
🔍 Full Diagnostic & Evaluation Complete assessment, power supply check, FM tuner performance, amplifier testing, baseline measurements
⚡ Power Supply Rebuild (P800) Replace all electrolytic capacitors, check bridge rectifiers, test voltage regulators
🎛️ Full Capacitor Replacement Replace ALL electrolytic and tantalum capacitors with audio-grade types
🔊 2SC458 Transistor Replacement Replace noisy 2SC458 transistors in preamp/phono with KSC1845
📻 FM Tuner Alignment Complete FM front-end and IF alignment, multiplex decoder alignment
🎚️ Amplifier Calibration Bias adjustment, DC offset calibration, power output verification
✨ Mechanical & Cosmetic Service Clean controls, lubricate tuning capacitor, replace dial lamps with warm white LEDs or OEM
🏆 COMPLETE FULL RESTORATION All services above – your 2230 will sound and perform like new
📋 Complete Marantz Model 2230 Capacitor Replacement Database
⚠️ TOTAL: 60+ capacitors replaced – 50 electrolytic + 10+ film upgrades. I replace every single one regardless of appearance.
⚡ POWER SUPPLY BOARD (P800)
| Location | Original Value | My Replacement | Notes |
|---|
| C801 | 3300µF / 35V | 4700µF / 50V (Nichicon KG) | Main filter - LEFT channel |
| C802 | 3300µF / 35V | 4700µF / 50V (Nichicon KG) | Main filter - RIGHT channel |
| C803 | 1000µF / 35V | 1000µF / 50V (Nichicon PW) | Regulator supply |
| C804 | 470µF / 35V | 470µF / 50V (Nichicon PW) | Regulator output |
| C805 | 100µF / 25V | 100µF / 50V (Nichicon FG) | Bias supply filter |
| C806 | 100µF / 25V | 100µF / 50V (Nichicon FG) | Bias supply filter |
| C807 | 47µF / 35V | 47µF / 50V (Nichicon PW) | Protection circuit |
| C808 | 47µF / 35V | 47µF / 50V (Nichicon PW) | Protection circuit |
🔊 MAIN AMPLIFIER BOARD (P700 – Left & Right Channels)
| Location | Original Value | My Replacement | Notes |
|---|
| C701/C751 | 10µF / 35V | 10µF / 50V (Nichicon FG) | Input coupling |
| C702/C752 | 10µF / 35V | 10µF / 50V (Nichicon FG) | Feedback cap |
| C703/C753 | 100µF / 25V | 100µF / 50V (Nichicon FG) | Bootstrap cap |
| C704/C754 | 100µF / 25V | 100µF / 50V (Nichicon FG) | Bootstrap cap |
| C705/C755 | 100µF / 25V | 100µF / 50V (Nichicon FG) | Decoupling |
| C706/C756 | 47µF / 35V | 47µF / 50V (Nichicon PW) | Compensation |
| C707/C757 | 220µF / 25V | 220µF / 50V (Nichicon PW) | Power decoupling |
| C708/C758 | 220µF / 25V | 220µF / 50V (Nichicon PW) | Power decoupling |
🎛️ PREAMPLIFIER / TONE BOARD (PE01)
| Location | Original Value | My Replacement | Notes |
|---|
| C401, C402 | 100µF / 25V | 100µF / 50V (Nichicon FG) | Power decoupling |
| C403, C404 | 10µF / 25V | 10µF / 50V (WIMA MKS2) | FILM UPGRADE - coupling |
| C405, C406 | 47µF / 25V | 47µF / 50V (Nichicon FG) | Tone control |
| C407, C408 | 100µF / 25V | 100µF / 50V (Nichicon FG) | Decoupling |
| C409, C410
| (Values vary by revision) – replaced with Nichicon FG
| Output coupling
|
📀 PHONO PREAMP BOARD (P500)
| Location | Original Value | My Replacement | Notes |
|---|
| C501, C502 | 100µF / 25V | 100µF / 50V (Nichicon FG) | Power decoupling |
| C503, C504 | 10µF / 25V | 10µF / 50V (Nichicon FG) | Input coupling |
| C505, C508 | 2200pF | 2200pF / 100V (Polystyrene) | FILM UPGRADE - RIAA EQ |
| C506, C507 | 0.022µF | 0.022µF / 100V (WIMA) | FILM UPGRADE - RIAA EQ |
| C509, C510 | 100µF / 25V | 100µF / 50V (Nichicon FG) | Output coupling |
📻 FM IF BOARD (P200)
| Location | Original Value | My Replacement | Notes |
|---|
| C201, C202 | 100µF / 25V | 100µF / 50V (Nichicon PW) | Power decoupling |
| C203, C204 | 10µF / 25V | 10µF / 50V (Nichicon PW) | Decoupling |
| C205, C206 | 4.7µF / 25V | 4.7µF / 50V (Nichicon PW) | IF amp decoupling |
| C207, C208
| (Values vary) – replaced with Nichicon PW
| Detector filter
|
🎵 MULTIPLEX DECODER BOARD (P300)
| Location | Original Value | My Replacement | Notes |
|---|
| C301, C302 | 100µF / 25V | 100µF / 50V (Nichicon PW) | Power supply |
| C303, C304 | 10µF / 25V | 10µF / 50V (Nichicon PW) | Decoupling |
| C305, C306 | 1µF / 25V | 1µF / 50V (WIMA film) | FILM UPGRADE - audio coupling |
| C307, C308
| (Values vary) – replaced with Nichicon PW
| 19kHz/38kHz filters
|
📦 CAPACITOR REPLACEMENT SUMMARY:
Power Supply: 8 caps • Main Amp L/R: 16 caps • Preamp/Tone: 10 caps (4 film upgrades)
Phono Preamp: 10 caps (4 film upgrades) • FM IF: 8 caps • Multiplex: 8 caps (2 film upgrades)
TOTAL: 60+ capacitors – 50+ electrolytic + 10+ film upgrades
🔧 MY BRAND PREFERENCES FOR 2230:
• Main filter caps: Nichicon KG (upgraded to 4700µF/50V for better performance)
• General low ESR: Nichicon PW, Panasonic FC
• Audio signal path: Nichicon FG (Fine Gold), Elna Silmic II
• 2SC458 replacement: KSC1845 (direct fit, lower noise)
• Film upgrades: WIMA MKS2, Polystyrene (RIAA)
⚠️ NOTE FROM MY WORKBENCH: I replace every electrolytic capacitor regardless of appearance – they age even if not bulging. I document polarity before removal. After recap, I verify all voltage rails and allow 60 minutes of burn-in before calibration.
🔧 Problematic Transistor Replacement – The 2SC458 Issue
| Original Transistor | Location | My Replacement | Notes |
|---|
| ⚠️ CRITICAL – MUST REPLACE: 2SC458 transistors are notorious for becoming noisy and intermittent. I replace ALL of them. |
| 2SC458 | Preamp (PE01), Phono (P500) | KSC1845 | Direct replacement, much lower noise, higher gain |
| 2SC871 | Tone control, other sections | KSC1845 or KSC945 | Replaces noisy transistors |
| 2SA493}.\]Amplifier driver | KSA992}.\]Matched pair recommended |
💡 WHY I REPLACE 2SC458 TRANSISTORS: These transistors develop internal leakage and noise over time, causing hiss, crackling, popping, and intermittent operation. Replacing them with modern KSC1845 eliminates these issues and dramatically improves signal-to-noise ratio. This is a critical part of my 2230 restoration.
🔧 Professional Troubleshooting Tips – From My Workbench
💡 TIP #1: No Power / Dead Unit
- Check AC power cord and main fuse (located on the back panel)
- Test power transformer primary and secondary voltages
- Check bridge rectifier diodes (H801) – replace with 3A/400V modern types
- Main filter capacitors (C801, C802) often degrade – I replace with upgraded 4700µF/50V
💡 TIP #2: Noisy / Crackling Sound – The Classic 2230 Issue
- 2SC458 transistors in the preamp and phono stages are almost always the culprit
- I replace ALL 2SC458 transistors with KSC1845 – this eliminates the noise permanently
- Symptoms: hiss, crackling, popping, especially at low volume or with no input
💡 TIP #3: FM Tuner Issues – Weak Reception, No Stereo, Drifting
- FM alignment drift is common after 50+ years – I perform full 10.7MHz IF alignment
- Check the FM front end transistors – replace if weak
- If stereo light is on but no separation, the multiplex decoder needs alignment
- Dirty tuning capacitor causes intermittent reception – I clean with compressed air
💡 TIP #4: Amplifier Distortion or One Channel Dead
- Check and adjust bias current – factory spec is 10-15mV across emitter resistors
- Test output transistors – replace with matched MJ21193/21194 if failed
- Replace all electrolytics on amplifier board (P700)
- Check DC offset at speaker terminals – adjust to near 0mV
💡 TIP #5: Hum in Both Channels
- Almost always bad main filter capacitors (C801, C802)
- I replace with upgraded Nichicon KG 4700µF/50V for improved performance
- Also check bridge rectifier and ground connections
💡 TIP #6: Dial Lamps Dim or Out – The Famous Blue Glow
- The 2230 uses fuse-style lamps (8V/200mA for dial, 6.3V/200mA for meters)
- I offer warm white LED upgrades – brighter, cooler operation, never burn out
- Can also use OEM-style incandescent if you prefer original look
💡 TIP #7: Phono Stage Issues – No Sound, Distortion, Hum
- First, replace all 2SC458 transistors on the phono board
- Replace electrolytic capacitors – they cause RIAA EQ drift
- Check phono input jacks for loose solder joints
- If hum persists, check grounding – the phono stage is very sensitive
⚠️ SAFETY NOTE: The Marantz 2230 contains high-voltage sections (35V B+). Always discharge power supply capacitors before servicing. I use proper safety procedures.
🔍 Quick Troubleshooting Reference Chart
| Symptom | Most Likely Cause | My Fix |
|---|
| No power, no lights | Blown fuse, dead transformer | Replace fuse, check rectifiers, test transformer |
| No sound, lights work | Speaker relay (if equipped), output transistors | Check DC offset, test outputs, check protection circuit |
| One channel dead or distorted | Output transistor failure, bad caps | Test outputs, replace caps, recalibrate bias |
| Hiss/crackling/pop | 2SC458 transistors | Replace ALL 2SC458 with KSC1845 |
| Weak FM / no stereo | FM alignment drifted | Full FM alignment, check front end transistors |
| Hum in both channels | Bad main filter caps | Replace C801, C802 with upgraded 4700µF |
| Tuning knob stiff | Dirty tuning capacitor | Clean with compressed air, fresh lubricant |
| Phono stage noisy or dead | 2SC458 transistors, bad caps | Replace transistors, recap phono board |
Deep Dive: My Marantz 2230 Restoration Process
⚡ POWER SUPPLY (P800)
- Main Filter Capacitors (C801, C802): Original 3300µF/35V – I upgrade to 4700µF/50V Nichicon KG for improved ripple rejection and bass response.
- Bridge Rectifier (H801): I replace old diodes with modern 3A/400V ultra-fast soft recovery types.
- Bias Supply: I rebuild the negative bias supply with fresh capacitors (C805, C806).
- Protection Circuit: I recap the protection circuit (C807, C808) for reliable relay operation.
🔊 MAIN AMPLIFIER (P700)
- Capacitor Replacement: All electrolytics replaced – input coupling, bootstrap, decoupling, compensation.
- Output Transistors: Original 2SD287/2SB537 – I test and replace with matched MJ21193/21194 if needed.
- Driver Transistors: I test and replace if noisy or out of spec.
- Bias Adjustment: I set bias to 10-15mV across emitter resistors (R763/R764).
- DC Offset: I adjust DC offset at speaker terminals to <±5mV.
🎛️ PREAMPLIFIER & PHONO (PE01 & P500)
- 2SC458 Transistor Replacement: I replace ALL 2SC458 transistors with KSC1845 – this is critical for noise elimination.
- Capacitor Replacement: All electrolytics replaced. Small-value coupling caps upgraded to WIMA film.
- RIAA EQ: Phono stage capacitors upgraded to 1% polystyrene for accurate equalization.
📻 FM TUNER & MULTIPLEX (P200 & P300)
- IF Alignment: Full 10.7MHz alignment using sweep generator and oscilloscope.
- Multiplex Alignment: 38kHz oscillator and separation adjustment for >35dB stereo separation.
- Capacitor Replacement: All electrolytics replaced with low-leakage Nichicon PW.
Precision FM Alignment Procedure – As I Perform It
📻 MY FM ALIGNMENT PROCESS FOR MARANTZ 2230:
- FM Front End Alignment: I align the RF amplifier, local oscillator, and mixer for maximum sensitivity using a precision signal generator.
- 10.7MHz IF Alignment: Using a sweep generator and oscilloscope, I align each IF transformer for proper bandpass response and gain.
- Discriminator / Ratio Detector: I adjust for minimum distortion and correct center tuning using a distortion analyzer.
- Multiplex Decoder Alignment: I adjust the 38kHz oscillator and separation controls for maximum stereo separation (>35dB).
- Result: Your 2230 will pull in distant stations clearly, with quiet background and precise stereo imaging.
Marantz Model 2230 Specifications
| Parameter | Specification |
|---|
| Power Output | 30 watts per channel (8Ω, both channels driven) |
| Frequency Response | 20Hz-20kHz ±0.5dB |
| THD | <0.5% at rated power |
| FM Sensitivity | 2.0µV (IHF) |
| FM Stereo Separation | >35dB at 1kHz |
| Inputs | Phono, Tape, Aux, FM, AM |
| Outputs | Tape out, Headphone, Speaker A/B |
| Dimensions (WxHxD) | 17.3" x 5.4" x 13.5" |
| Weight | Approx 28 lbs (12.7 kg) |
Nationwide Service – We Ship Across America
🇺🇸 NATIONWIDE SERVICE AVAILABLE 🇺🇸
Ship your Marantz 2230 securely to my Los Angeles facility – I serve customers across all 50 states
- Secure Packaging: I provide detailed packing instructions – double-boxing, secure the tuning knob
- Insured Shipping: Fully insured shipping recommended for your valuable receiver
- Nationwide Reach: I've restored 2230 receivers for clients from NY to CA, TX to WA
- Direct Contact: Email jt@tekmg.com for a quick quote
Frequently Asked Questions – Marantz 2230
❓ Why is the 2230 so popular?
The 2230 has a warm, detailed sound signature, classic Marantz styling, and is one of the most reliable receivers from the 1970s. It's the perfect entry point into vintage audio.
❓ How long does a full restoration take?
Typically 2-3 weeks depending on parts availability. Rush service available.
❓ Do you offer nationwide service?
Yes! I serve customers across all 50 states with secure shipping instructions.
❓ What are the noisy transistors you replace?
2SC458 transistors in the preamp and phono stages – these fail and cause hiss/crackling. I replace them with modern KSC1845.
❓ Do you have spare parts for the 2230?
Yes – capacitors, transistors, lamps, and other components accumulated over 30 years.
❓ Do you warranty your work?
Yes, 90-day warranty on all parts and labor.
My Service Area – Local & Nationwide
🇺🇸 NATIONWIDE SERVICE AVAILABLE 🇺🇸
Ship your Marantz 2230 securely – I serve all 50 states
Local Service: Los Angeles County, Orange County, Ventura County, Riverside County, San Bernardino County.
Nationwide Service: Secure shipping options with detailed packing instructions.
Los Angeles County: LA Burbank Glendale Santa Monica Hollywood Pasadena
Nationwide: NY TX FL IL WA All 50 States
TEK Media Group — Vintage Marantz Restoration Since 1994
📞 (818) 244-4440 | ✉️ jt@tekmg.com
Marantz 2230 Specialist • 2SC458 Replacement • FM Alignment • 30+ Years Experience
Every 2230 gets my personal attention – I'm the technician who does the work. Email me at jt@tekmg.com.
